Knowledge Base

Mites are a serious threat in hydroponic lettuce systems. This guide covers identification, cultural controls, biological IPM options, and safe chemical interventions to protect your crop.

Not all commercial seeds are created equal. This guide breaks down the difference between untreated and organic seeds to help you choose the right option for your growing program.

Compare the top mini and baby cucumber varieties — Splash, Corinto, Excelsior, Katrina, Colin, Quail, and Parakeet — across yield, disease resistance, fruit quality, and seasonal fit. Shop Mini Cucumber Varieties → Introduction Mini and baby cucumbers have dramatically increased in popularity over the last few years. Mini cucumbers are now a standard, and baby types are quickly becoming the new favorite. But choosing the right variety is important depending on your intended market segment and production capabilities — disease resistance, fruit uniformity, vigor, and shelf life vary significantly across genetics. Here's how seven leading varieties stack up. Mini vs. Baby Cucumber: A Quick Distinction Mini cucumbers — seedless, thin-skinned, harvested at 4–6 inches; bred for uniformity and retail bag formats Baby cucumbers — harvested smaller at 3–4 inches; tender skin and mild flavor suited for snacking and specialty markets Both thrive in high-wire greenhouse systems. See our full Mini Cucumbers Growing Guide for production basics. Variety Comparison Variety Category Key Strength Best For Splash Mini Yield & uniformity High-volume retail Corinto Mini Disease resistance Commercial greenhouse Excelsior Mini/Baby Year-round vigor Mixed-season production Katrina Mini Fruit quality & shelf life Premium retail & direct sales Colin Baby Adaptability Flexible crop scheduling Quail Mini (Beit Alpha/Persian) Early maturity & daily harvest Late autumn & early spring production Parakeet Mini/Baby (Beit Alpha/Persian) Taste, aroma & productive laterals Snacking & specialty markets Variety Profiles Splash High-yielding with consistent fruit size and smooth skin — built for intensive production and retail pack formats. Full variety spotlight → Shop Splash F1 (Untreated) → Corinto The greenhouse workhorse. Strong disease resistance package (powdery mildew, CMV) makes it reliable across seasons. Full variety profile → Shop Corinto F1 (Treated) → Excelsior Bridges mini and baby categories with strong vigor in both high- and low-light conditions — a solid year-round performer. Shop Excelsior F1 (Treated) → Katrina Premium baby cucumber with smooth skin, excellent crunch, and extended shelf life. Ideal for retail clamshells and direct sales. Shop Katrina (Non-Treated) → | Shop Katrina F1 (Treated) → Colin Flexible across seasons and production windows — a practical choice for mixed-season operations. Shop Colin F1 → Quail An early Beit Alpha/Persian mini cucumber with a semi-multi-fruited habit, short internodes, and small leaves. Parthenocarpic and all-female flowered, Quail produces 10–12 cm fruit with very good taste and aroma — well suited to daily harvest in late autumn and early spring greenhouse production. Shop Quail F1 → Parakeet A small, early Beit Alpha/Persian baby cucumber with productive lateral shoots, shiny light-green fruit, and excellent taste and aroma. Parthenocarpic and all-female flowered, Parakeet produces 9–11 cm fruit and is suited to daily harvest in late autumn and early spring greenhouse seasons. Shop Parakeet F1 → Which Variety Is Right for You? Disease pressure? → Corinto Premium retail or specialty market? → Katrina Year-round, variable light? → Excelsior High-volume commercial? → Splash Flexible scheduling? → Colin Late autumn or early spring, daily harvest? → Quail or Parakeet Snacking & specialty markets? → Parakeet Key Growing Tips Pruning: How to prune greenhouse cucumbers → Germination: Best germination methods → Spacing: Plant spacing guide → Seasonal timing: Summer planting guide → | Fall prep guide → Ready to Order? Browse our full Mini Cucumber Varieties →, Greenhouse Cucumber →, and Cucumber Rootstock → collections.

A practical guide to understanding why greenhouse lettuce bolts and how to reduce its incidence through variety selection, environmental management, and crop scheduling.

A practical guide to understanding and optimizing tomato fruit set in greenhouse production — covering pollination methods, temperature, humidity, plant nutrition, and common causes of poor fruit set.

The Short Answer: No Parthenocarpic cucumbers set fruit without pollination. Fruit development is triggered internally by plant hormones rather than fertilization, which means no viable seeds form. The result is naturally seedless cucumbers — not through processing, but through biology. What “Seedless” Actually Means Seedless doesn’t mean completely empty inside. Parthenocarpic cucumbers can have a seed cavity and small, undeveloped seed structures — but these are usually blind seeds: non-viable, unfertilized, and incapable of germination. They’re soft, barely noticeable, and have no impact on eating quality. What’s absent is the hard, fully developed seed found in pollinated fruit. What Happens If They Are Pollinated? Accidental pollination — from stray insects or introduced pollinators — triggers viable seed development and compromises fruit quality. Pollinated fruit tends to be misshapen, inconsistently sized, and lower in market value. This is why most greenhouse operations actively exclude pollinators to protect the seedless profile. Greenhouses: The Ideal Environment Controlled greenhouses make pollinator exclusion simple, enabling consistent seedless fruit set from every flower with no hand-pollination labor. It’s why parthenocarpic varieties have become the commercial greenhouse cucumber standard. For timing and setup, see our Preparing Your Greenhouse for Fall Production guide. Open-Field Considerations Outdoor production is possible but requires more management. Pollinator pressure is harder to control, and partial pollination can trigger viable seed development. Row covers during critical fruit-set windows can help protect seedless quality. For germination best practices regardless of setting, see Best Methods to Germinate Greenhouse Cucumber Seed. Summary Parthenocarpic cucumbers don’t need pollination. Fruit may contain a seed cavity or blind, non-viable seed structures, but no hard, germinable seeds. Maintain a pollinator-free environment, choose varieties with strong parthenocarpic expression, and you’ll consistently deliver the uniform, seedless cucumbers. Ready to find the right variety? Browse our Long English Cucumbers and Mini Cucumber Varieties — all parthenocarpic, all greenhouse-proven.

Thermal dormancy prevents lettuce seed from germinating in warm conditions. Learn what causes it, how pelleted seed helps, and practical strategies to achieve consistent germination in summer.

A focused guide to flower abortion in greenhouse tomato production — covering causes, identification, and practical management strategies.

Welcome to Your First Greenhouse Starting a greenhouse can feel overwhelming — but it doesn't have to be. This guide answers the most common questions new greenhouse growers ask, so you can get growing with confidence. What Should I Grow? How to Decide Choosing your first crop comes down to three factors: Your environment. What temperatures can you reliably maintain? Cool greenhouses (55–70°F) suit lettuce and leafy greens. Warmer setups (70–80°F) open the door to cucumbers, tomatoes, and peppers. Your timeline. Lettuce is ready to harvest in 30–45 days. Tomatoes and cucumbers take 60–90+ days from transplant. Start with a fast crop to build confidence and cash flow. Your market. Selling locally? Lettuce and herbs have strong demand and short cycles. Looking for higher per-unit value? Specialty tomatoes and mini cucumbers command premium prices. As a general rule: start simple, succeed fast, then scale up. One crop mastered is worth more than three crops struggling. What crops are easiest for beginners? Lettuce and leafy greens are the best starting point — fast-growing, forgiving, and high-value. Not sure which variety to start with? Our guide on which romaine lettuce to use for greenhouse production is a great place to begin. Once you're comfortable with your environment controls, move on to cucumbers, then tomatoes and peppers. Papaya is a longer-term crop suited to warmer, more experienced operations. What temperature should my greenhouse be? Most vegetable crops thrive between 65–80°F (18–27°C) during the day and no lower than 55°F (13°C) at night. Lettuce and leafy greens tolerate cooler temps (55–70°F), while tomatoes, cucumbers, and peppers prefer warmer conditions (70–80°F). Invest in a min/max thermometer and check it daily. How much light do my plants need? Most fruiting crops (tomatoes, cucumbers, peppers) need 14–18 hours of light per day. Leafy greens like lettuce can do well with 12–16 hours. In low-light seasons or northern climates, supplemental LED grow lights are essential for consistent production. How often should I water? Watering frequency depends on your growing medium, crop, and climate. A general rule: water when the top inch of your growing medium feels dry. In hydroponic systems, maintain consistent nutrient solution levels and EC/pH targets. Overwatering is one of the most common beginner mistakes — always check before you water. Learn more about fertilizing your greenhouse seedlings to pair watering with the right nutrition schedule. What is EC and pH, and why do they matter? EC (Electrical Conductivity) measures the concentration of nutrients in your water. Too low and plants starve; too high and they get nutrient burn. pH determines whether plants can actually absorb those nutrients. Most crops prefer a pH of 5.8–6.2 in hydroponic systems. Test both daily when starting out. Make sure equipment is calibrated correctly! Do I need to pollinate my plants? In a closed greenhouse, there are no bees or wind to pollinate fruiting crops like tomatoes and peppers. You'll need to pollinate manually — gently shake flower clusters or use an electric pollinator wand daily when flowers are open. For tomatoes specifically, proper pruning also plays a big role in fruit set — see our guide on how to prune indeterminate tomatoes in a greenhouse. Cucumbers grown in greenhouses are typically parthenocarpic (self-fruiting) and don't require pollination. How do I prevent pests and disease? Prevention is everything in a greenhouse environment. Key habits include: Inspect plants daily for early signs of pests or disease Maintain good airflow with fans and proper spacing Keep humidity in check — high humidity invites fungal issues like Pythium and Botrytis. Read our deep-dive on Pythium prevention in hydroponic lettuce Sanitize tools, trays, and surfaces between crops Source certified, disease-free seed from a reputable supplier For lettuce growers, knowing what to look for early is critical. Our Lettuce Disease Identification Guide covers the most common issues and how to respond. How do I know if my seeds are good quality? Start with seed from a trusted supplier that offers germination rate data, disease resistance information, and variety-specific growing guides. At Paramount Seeds, all varieties are selected for controlled-environment performance — so you're starting with genetics built for greenhouse success. Ready to Grow? The best way to learn is to start. Pick one crop, dial in your environment, and build from there. Have more questions? Browse our Knowledge Base or explore our seed varieties to find the right fit for your operation.

A complete grower's guide to determinate tomatoes: how they differ from indeterminate types, production advantages, and top varieties available from Paramount Seeds.

Great news for greenhouse growers in Puerto Rico — as a US Territory our full catalog of pelleted and non-pelleted seeds, rootstocks, and disease-resistant varieties is now available and ships directly to your door. Browse our main categories: Tomatoes, Lettuce, Cucumber, and Pepper. Orders ship via USPS, UPS, or FedEx as standard domestic shipments — no customs fees, no import permits required. Delivery typically takes 5–10 business days. Visit paramountseeds.com to order, or contact our team with any questions. Paramount Seeds Ahora Envía a Puerto Rico Excelentes noticias para los cultivadores de invernadero en Puerto Rico — nuestro catálogo completo de semillas pelletizadas y no pelletizadas, portainjertos y variedades resistentes a enfermedades ya está disponible con envío directo a su puerta. Explore nuestras categorías principales: Tomates, Lechuga, Pepino y Pimiento. Los pedidos se envían por USPS, UPS o FedEx como envíos domésticos estándar — sin cargos de aduana ni permisos de importación requeridos. La entrega generalmente toma de 5 a 10 días hábiles. Visite paramountseeds.com para ordenar, o comúníquese con nuestro equipo si tiene alguna pregunta.

Papaya Ring Spot Virus (PRSV) is one of the most destructive pathogens affecting papaya production worldwide. This guide covers identification, transmission, integrated management, and variety selection strategies for growers.

A quick-reference germination guide for all major seed categories carried by Paramount Seeds — including tomatoes, cucumbers, peppers, lettuce, herbs, and more.

HR and IR resistance ratings on seed labels tell you how well a variety can withstand specific pathogens. Learn the difference, which diseases to watch for by crop, and how to use resistance data to make smarter variety selections.

Pythium root rot is one of the most damaging diseases in hydroponic lettuce production. Learn how to prevent it through water management, sanitation, variety selection, and biological controls.

Picking the right seed variety can make or break a season. Learn how AI tools are helping greenhouse growers make smarter, data-backed variety decisions — matched to your environment, your market, and your goals.

Not sure whether to grow indeterminate or determinate tomatoes? This guide breaks down the key differences in growth habit, harvest timing, and best use cases to help you choose the right variety for your operation.

Why Pollination Matters in a Greenhouse Unlike field-grown tomatoes, greenhouse tomatoes can't rely on wind or outdoor pollinators to transfer pollen. Without adequate pollination, flowers drop and fruit set fails — directly impacting your yield and revenue. Understanding how to manage pollination in a controlled environment is one of the most important skills for any greenhouse grower. For expected yield benchmarks when pollination is optimized, see our greenhouse crop yield guide. Shop Greenhouse Tomato Varieties → How Tomato Pollination Works Tomatoes are self-fertile, meaning each flower contains both male and female parts. Pollen is released from the anther cone when the flower is vibrated at the right frequency — a process naturally triggered by bumblebees or wind outdoors. In a greenhouse, you need to replicate this vibration artificially. Indeterminate greenhouse varieties flower continuously throughout the season, making consistent pollination management essential from transplant to crop termination. Pollination Methods 1. Electric Pollination Wands The most common commercial method. A battery-powered wand is touched to the back of each open flower cluster (truss) for 1–2 seconds, causing the anther cone to vibrate and release pollen. This should be done every 1–3 days during the flowering period, ideally between 10 AM and 2 PM when temperatures and humidity are optimal. 2. Bumblebee Colonies Many large-scale greenhouse operations introduce commercial bumblebee hives (typically Bombus terrestris) for natural pollination. Bees are highly effective and reduce labor, but require careful management — including monitoring hive health, avoiding pesticide conflicts, and replacing colonies every 6–8 weeks. Maintain strict sanitation protocols when introducing hives to avoid bringing in pathogens. 3. Manual Shaking For small operations or trial plantings, gently shaking individual trusses or the plant support wire can transfer enough pollen for adequate fruit set. Less consistent than wands or bees, but useful as a backup method. Optimal Conditions for Pollination Pollination success is highly dependent on environmental conditions: Temperature: 65–75°F (18–24°C) during the day. Temperatures above 85°F (29°C) can cause pollen sterility. Relative Humidity: 60–70%. Too dry and pollen won’t stick; too humid and it clumps and won’t release. Light: Adequate light (DLI of 20–30 mol/m²/day) supports strong flower development and viable pollen. Timing: Pollinate during the warmest, brightest part of the day for best results. Canopy management: A well-pruned canopy improves airflow and light penetration, both of which support better flower development and pollination success. See our plant spacing guide for density recommendations that support good airflow. Signs of Poor Pollination Watch for these indicators that pollination is failing: Flower drop without fruit set Small, misshapen, or hollow fruit (catfacing) Uneven ripening across the truss Low fruit count per truss relative to variety expectations Note that some of these symptoms can also be caused by disease. See our guide to disease resistance ratings and watch for threats like ToBRFV, which can cause flower and fruit abnormalities that mimic pollination failure. Variety Considerations Some tomato varieties are more forgiving of suboptimal pollination conditions than others. Indeterminate greenhouse varieties bred for controlled environments — such as many of the varieties in the Paramount Seeds tomato catalog — are selected for strong fruit set and consistent performance under greenhouse conditions. See our beefsteak tomato variety guide for top-performing options with strong fruit set characteristics. Key Takeaways Consistent, well-timed pollination is foundational to greenhouse tomato productivity. Whether you use electric wands, bumblebees, or manual methods, the goal is the same: reliable vibration of open flowers during peak conditions, repeated every 1–3 days throughout the flowering cycle. Pair good pollination practice with proper pruning, climate control, and variety selection for the best results. Disclaimer: The information in this article is intended for educational purposes only. Always consult with a qualified agronomist or extension specialist before making changes to your growing practices. Results may vary based on variety, environment, and management conditions.

Disclaimer: The yield figures presented in this article are general benchmarks based on industry averages and published agronomic research. Actual yields will vary significantly depending on variety selection, growing system, climate control, crop management practices, pest and disease pressure, light levels, and grower experience. These figures should be used for planning and reference purposes only and do not constitute a guarantee of performance. Always consult variety-specific trial data and your local agronomist for site-specific projections. Introduction One of the most common questions from new and scaling greenhouse growers is: how much can I actually expect to harvest? Understanding realistic yield benchmarks helps with crop planning, financial projections, labor scheduling, and evaluating variety performance. This guide covers expected seasonal yields for the three most common greenhouse vegetable crops — tomatoes, cucumbers, and peppers — along with the key factors that influence where your results will land. Shop Greenhouse Vegetable Varieties → Greenhouse Tomatoes Typical Seasonal Yield Range Indeterminate greenhouse tomatoes grown on a long-season (9–11 month) production cycle typically yield: Beefsteak/large round: 55–75 kg per plant (120–165 lbs). See our beefsteak variety guide for top-performing options. Truss/cluster tomatoes: 50–70 kg per plant Cherry/cocktail types: 60–90 kg per plant due to higher fruit count per truss On a per-square-meter basis, well-managed crops in high-light regions typically achieve 60–80 kg/m²/year, with top Dutch-style operations exceeding 90 kg/m² under supplemental lighting. Pairing your scion with the right rootstock is one of the most effective ways to maximize season length and yield potential. Key Yield Influencers Light (DLI): The single biggest driver. Each additional mol/m²/day of light can add 3–5% to yield. CO₂ enrichment: Elevating CO₂ to 800–1,000 ppm during daylight hours typically increases yield 15–20%. Pollination quality: Poor fruit set directly reduces truss yield. Consistent electric wand or bumblebee pollination is essential. Pruning and leaf management: Maintaining the correct leaf count and removing suckers keeps energy directed to fruit. See our tomato plant spacing guide for density recommendations that support good canopy management. Disease pressure: Viruses like ToBRFV can devastate yield — variety selection and sanitation are your primary defenses. Variety: High-yielding greenhouse varieties bred for controlled environments consistently outperform field types. Greenhouse Cucumbers Typical Seasonal Yield Range Long English (European) cucumbers and mini cucumbers are the dominant greenhouse types: Long English cucumbers: 200–280 fruits per plant per season on a 9–10 month crop; approximately 60–80 kg/m²/year. Mini/snacking cucumbers: Higher fruit count per plant — 400–600 fruits per season — with per-weight yields of 50–70 kg/m²/year. See our mini cucumber grower's guide for variety selection help. Cucumbers are fast-maturing (first harvest typically 6–8 weeks after transplant) and produce continuously, making weekly harvest scheduling critical. Key Yield Influencers Temperature: Cucumbers are highly sensitive to cold. Night temperatures below 16°C (61°F) significantly reduce fruit set and growth rate. Humidity management: High humidity promotes powdery mildew; maintaining 70–80% RH with good airflow is essential. Pruning system: V-cordon, umbrella, or renewal pruning systems each affect fruit distribution and total yield differently. See our cucumber pruning guide for system-specific guidance. Parthenocarpy: Most greenhouse cucumber varieties are parthenocarpic (no pollination required), simplifying production. Greenhouse Peppers Typical Seasonal Yield Range Sweet bell peppers are the primary greenhouse pepper crop, with colored varieties (red, yellow, orange) commanding premium prices: Blocky/bell peppers: 25–35 kg/m²/year in standard production; high-performing operations reach 40–50 kg/m² under supplemental lighting. Specialty/snacking peppers: Yields vary widely by type, typically 20–35 kg/m²/year. Peppers have the longest time-to-harvest of the three crops — colored peppers take 10–14 weeks from fruit set to full color — so season planning and staggered planting are important for consistent supply. Key Yield Influencers Fruit load management: Carrying too many fruits simultaneously reduces individual fruit size and delays coloring. Regular thinning maintains quality. Light levels: Peppers are highly light-responsive. Supplemental HPS or LED lighting significantly improves winter yields. Stem density: Most commercial operations run 2 stems per plant at 3.5–4 plants/m², giving 7–8 stems/m². Calcium nutrition: Blossom end rot is a common calcium-related disorder; consistent irrigation and fertigation management is critical. Comparing Crops at a Glance Crop Typical Yield (kg/m²/year) Harvest Start Season Length Tomatoes (beefsteak) 60–80 10–14 weeks 9–11 months Cucumbers (Long English) 60–80 6–8 weeks 9–10 months Peppers (bell) 25–50 16–20 weeks 10–12 months Planning for Your Operation When projecting yields for your greenhouse, start with the lower end of the benchmark range and adjust upward based on your specific conditions — particularly light availability, climate control capability, and grower experience. Track actual yields per plant and per square meter from your first season to build your own baseline data, which will be far more accurate than any industry average for your specific site. Variety selection also plays a major role. Choosing varieties bred and trialed specifically for greenhouse production — rather than field or open-air types — is one of the highest-leverage decisions you can make. Browse the Paramount Seeds greenhouse vegetable catalog for varieties with documented greenhouse performance data. Final Note Yield potential is a ceiling, not a guarantee. The gap between benchmark yields and actual results is almost always explained by management factors within the grower's control: climate consistency, crop hygiene, irrigation precision, and timely scouting. Invest in those fundamentals first, and the yields will follow.