What to Grow in a Backyard Greenhouse

On this page (7 sections)

1. What to grow in a greenhouse by season
2. How do you choose crops for your greenhouse?
3. Can you start seeds in a backyard greenhouse?
4. What temperatures do greenhouse crops need?
5. How should you arrange plants inside a greenhouse?
6. What should beginners avoid growing first?
7. Which plants should you choose for a backyard greenhouse?

Grow leafy greens, herbs, seedlings, and warm-season crops such as tomatoes and peppers in a backyard greenhouse. Match your plants to the season, available light, space, and temperatures you can maintain.

A greenhouse can extend the growing season, but it doesn’t make every crop suitable for every setup. Start with a few plants you enjoy eating, then add crops as you learn how your greenhouse behaves through the day and across seasons.

What to grow in a greenhouse by season

Grow cool-season crops when temperatures are mild, and warm-season crops when you can provide enough heat and light. A greenhouse can protect plants from some outdoor weather, but conditions still vary by season and location.

Leafy greens such as lettuce and other salad greens are manageable choices for containers or shallow growing areas. Herbs can also fit well in pots, where you can move them as needed.

For warmer conditions, consider tomatoes, peppers, or other crops suited to your growing season. Check each plant’s mature size and growing needs before planting.

A vigorous plant can quickly crowd a small greenhouse.

Utah State University Extension notes that greenhouses can support vegetables, herbs, and wildflowers, while growing conditions and equipment needs vary by setup. Its guide to extending the garden season explains that year-round growing in cold climates may require added heat and light.

Which greenhouse plants suit a small space?

Choose leafy greens, herbs, seedlings, and compact varieties for a small greenhouse. These plants are easier to arrange in containers or vertically than sprawling crops that need broad floor space.

Shelves can keep seed trays and smaller pots organized while leaving floor space for larger containers. The Ohuhu 4-Tier Greenhouse Shelves, 2 Pack, has four mesh layers per unit and can be used with a walk-in greenhouse.

Check the shelf dimensions against your greenhouse and leave room to reach plants for watering. Each shelf can hold up to 22 lb.

How do you choose crops for your greenhouse?

Choose crops based on what you eat, how much room they need, and whether your greenhouse can provide their growing conditions. A short list of well-suited plants is easier to manage than a mix with very different needs.

Use these questions to narrow your choices:

• How much direct light reaches the greenhouse?
• What are the day and night temperatures where you’ll grow?
• Can you ventilate the space on sunny days?
• Will crops grow in containers, beds, or seed trays?
• How much time can you give to watering and harvesting?

For a first season, try one or two greens, a few herbs, and a small number of fruiting plants. A simple mix makes it easier to spot which crops suit the space.

For help comparing structures and covers, see our backyard greenhouse guide.

Can you start seeds in a backyard greenhouse?

Yes, a greenhouse can give seedlings a protected place to start, as long as you manage light, moisture, and temperature. Keep seed trays where you can check them often, since small containers can dry out faster than larger pots.

A compact setup with shelves and a covered frame can help keep trays together. The Pure Garden 4-Tier Mini Greenhouse on Wheels has four shelves, a PVC cover, and locking wheels, so it may suit a small starting area you want to move.

Check the available light before placing seedlings inside. A greenhouse cover doesn’t replace sufficient light, and a closed space can warm quickly in direct sun.

Ventilate it as needed, and check the seedlings rather than relying on the outdoor weather alone.

For a step-by-step approach, read how to start seeds in a greenhouse. If you use shelves, measure the floor space and the plants’ height before arranging trays.

What temperatures do greenhouse crops need?

Use the temperature range recommended for each crop, and check the greenhouse itself rather than assuming it matches the outdoor air. Sunlight can warm an enclosed space, while nights can cool it again.

A thermometer helps you notice temperature swings. Ventilation can release excess daytime heat, while a heater may be needed for crops that require warmer conditions.

The right choice depends on your climate, the structure, and what you’re growing.

A heat mat controller can regulate a compatible heating device during seed starting. The BN-LINK Digital Heat Mat Thermostat Controller has a temperature probe and is intended for heating devices such as seedling heat mats.

It does not include a heat mat.

Use it with a compatible heating device and keep the total load within its 1000 W maximum. For greenhouse-wide conditions, see what temperature a greenhouse should be.

How should you arrange plants inside a greenhouse?

Put plants where their light, height, and watering needs are easy to manage. Keep taller crops from shading smaller ones, and leave enough room to reach each pot or bed.

Use shelves for trays and compact pots, with larger plants on the floor or in beds. Group plants with similar watering needs when practical, but make sure leaves have room for airflow.

A walk-in structure with shelves can suit gardeners growing several kinds of plants in a limited footprint. The Ohuhu 57x57 Walk-In Greenhouse with Screen Windows has 12 shelves and 2 screened windows.

Measure the available yard space and check that you can reach the plants without squeezing past them. For more layout ideas, see what shelves work best inside a greenhouse.

What should beginners avoid growing first?

Avoid starting with crops that outgrow your space or need conditions you can’t maintain. Large, sprawling plants can take over a small greenhouse, and warmth-loving crops may struggle when nights remain cold.

Don’t fill every shelf at once. Leave room to water, inspect leaves, and remove plants that finish or develop problems.

If a crop repeatedly needs more space or climate control than you can provide, try a smaller variety or a different season.

Which plants should you choose for a backyard greenhouse?

For a first greenhouse season, start with greens, herbs, and a few seedlings, then add tomatoes or peppers if your space and temperatures suit them. Pick plants you’ll use and check their mature size before planting.

Choose shelves if you need more room for trays, a compact covered unit for a small starting area, or a walk-in structure for a larger collection. To choose the structure itself, start with our guide to backyard greenhouse types, sizes, and covers.

Frequently asked questions

What grows best in a small greenhouse?

Leafy greens, herbs, seedlings, and compact varieties are practical choices for a small greenhouse because they can fit in containers or on shelves. Tomatoes and peppers can also work if you give them enough light, room, and warmth.

Check mature plant size before choosing varieties.

Can you grow vegetables in a greenhouse all year?

You can grow some vegetables for longer in a greenhouse, but year-round harvest depends on your climate, daylight, temperature, and whether you can provide heat or supplemental light. Cool-season greens may suit a cooler period, while warm-season crops need more warmth and light.

Do vegetables need pollination in a greenhouse?

Some fruiting vegetables benefit from pollination, and a closed greenhouse may limit access by outdoor pollinators. Check the needs of each crop and variety.

Airflow, hand pollination, or access for pollinators may help, depending on the plant and your setup.

Should I start seeds or grow mature plants in a greenhouse?

Either can work, depending on your space and goal. Starting seeds uses a small area early in the season, while growing mature plants takes more room and ongoing care.

If you plan to start seeds, see our guide to starting seeds in a greenhouse.