Sunlight Requirements Calculator
Find out which vegetables, herbs, and greens match your garden's light conditions. Enter your sunlight hours and light quality to see which plants will thrive, which will survive, and which to avoid.
Every plant has a minimum sunlight threshold for healthy growth and fruit production. Fruiting crops like tomatoes and peppers demand full sun, while leafy greens and herbs can produce well in partial shade. This calculator matches your specific light conditions to the right plants so you do not waste time or money on crops that will struggle.
Data last updated: March 2026
Light quality adjusts how effective your sun hours are. Dappled or shaded light is less intense than open-sky direct sun.
✅ Perfect Match (35)
These plants are ideal for your light conditions and should thrive with 6.0 effective sun hours.
Lettuce
Needs 4-6 hrs direct sun
Spinach
Needs 4-6 hrs direct sun
Kale
Needs 4-6 hrs direct sun
Swiss Chard
Needs 4-6 hrs direct sun
Arugula
Needs 4-6 hrs direct sun
Broccoli
Needs 4-6 hrs direct sun
Cabbage
Needs 4-6 hrs direct sun
Cauliflower
Needs 4-6 hrs direct sun
Brussels Sprouts
Needs 4-6 hrs direct sun
Tomato
Needs 6+ hrs direct sun
Pepper
Needs 6+ hrs direct sun
Cucumber
Needs 6+ hrs direct sun
Zucchini
Needs 6+ hrs direct sun
Squash (Winter)
Needs 6+ hrs direct sun
Eggplant
Needs 6+ hrs direct sun
Watermelon
Needs 6+ hrs direct sun
Pumpkin
Needs 6+ hrs direct sun
Carrot
Needs 4-6 hrs direct sun
Beet
Needs 4-6 hrs direct sun
Radish
Needs 2-4 hrs direct sun
Potato
Needs 6+ hrs direct sun
Sweet Potato
Needs 6+ hrs direct sun
Turnip
Needs 4-6 hrs direct sun
Parsnip
Needs 4-6 hrs direct sun
Green Bean (Bush)
Needs 6+ hrs direct sun
Green Bean (Pole)
Needs 6+ hrs direct sun
Pea
Needs 4-6 hrs direct sun
Onion
Needs 4-6 hrs direct sun
Garlic
Needs 2-4 hrs direct sun
Leek
Needs 4-6 hrs direct sun
Basil
Needs 2-4 hrs direct sun
Cilantro
Needs 2-4 hrs direct sun
Dill
Needs 2-4 hrs direct sun
Parsley
Needs 2-4 hrs direct sun
Sweet Corn
Needs 6+ hrs direct sun
💡 Tips for Maximizing Sunlight
- Reflective mulch: White plastic or aluminum-coated mulch reflects light back up onto plant leaves, effectively increasing the light your plants receive by 10 to 20 percent.
- Prune nearby trees: Removing lower branches (called "limbing up") raises the canopy and allows more direct sunlight to reach your garden, especially during morning hours.
- Container mobility: Growing in pots or rolling planters lets you move plants throughout the day to follow the sun. This is especially useful on patios, balconies, or yards with shifting shade patterns.
- Paint walls and fences white: Light-colored surfaces near your garden reflect additional sunlight onto your plants, which can make a meaningful difference in tight urban spaces.
- Raised beds at the sunny edge: Position raised beds along the south-facing edge of your yard (in the Northern Hemisphere) to capture the most direct light throughout the day.
- Succession planting by season: Take advantage of seasonal sun angles. Plant sun-loving crops in summer when days are longest, and transition to shade-tolerant greens in spring and fall when the sun is lower.
Recommended Resources
Garden Sun Meters
Accurately measure sunlight levels in your garden with a digital light meter. Know exactly how many hours of direct sun each spot receives.
Rolling Plant Caddies
Move heavy containers to follow the sun throughout the day. Rolling caddies make container gardening practical for shady yards.
Frequently Asked Questions
Most fruiting vegetables like tomatoes, peppers, squash, and cucumbers need at least 6 to 8 hours of direct sunlight per day. Leafy greens such as lettuce, spinach, and kale can grow well with 4 to 6 hours. Herbs like cilantro, parsley, and mint are the most shade-tolerant and can produce with as little as 2 to 4 hours of direct light.
Understanding Sunlight for Gardening
Sunlight is the primary energy source for plant growth through photosynthesis. The amount and quality of light your garden receives determines which crops will thrive and which will struggle. Fruiting vegetables like tomatoes, peppers, and squash need the most energy to produce fruit, so they require 6 or more hours of direct sunlight. Leafy greens like lettuce and spinach primarily grow leaves, which requires less energy, making them well-suited to 4 to 6 hours of sun. Herbs and shade-tolerant greens can photosynthesize efficiently even in low-light conditions with just 2 to 4 hours of direct sun.
Measuring Your Garden's Sunlight
- Track sunlight manually by checking your garden every hour from sunrise to sunset and noting which areas are in direct sun versus shade. Do this on a clear day during the growing season for the most accurate reading.
- Digital sun meters (placed in the garden for a full day) give precise measurements and are especially useful for gardens with complex shade patterns from trees, buildings, or fences.
- Remember that sun patterns change with the seasons. A spot that gets 8 hours of sun in June may only get 4 hours in March or October when the sun is lower in the sky.
- Use the planting date calculator to time your crops, and check the companion planting guide to pair shade-tolerant and sun-loving plants together strategically.
Never Miss Planting Season
Get seasonal reminders straight to your inbox — we'll tell you when to start seeds, transplant, and harvest.
Affiliate disclosure: We may earn a commission from links on this page. Learn more.