Start with what grows well in shallow soil and warm conditions

Raised beds warm up faster in spring and drain better than ground soil, which means they favor crops that like heat and don't need deep roots. Lettuce, spinach, kale, chard, radishes, carrots, beets, bush beans, peas, zucchini, summer squash, peppers, and tomatoes all thrive in raised beds. The soil depth you built determines what you can grow — a 6-inch bed works for leafy greens and root crops like radishes; an 8-inch bed handles carrots and beets; a 10-to-12-inch bed is the minimum for tomatoes, peppers, and squash.

The real advantage of a raised bed is that you control the soil mix. You can fill it with a blend of compost, peat moss or coconut coir, and perlite or vermiculite — a mix that drains well and holds nutrients without the compaction and poor drainage of native ground soil. This matters because plants in raised beds are more exposed to sun and wind, so they dry out faster than in-ground gardens. Better soil means better water retention and fewer problems with root rot or nutrient deficiency.

Key Takeaways

  • Lettuce, spinach, kale, radishes, and carrots grow in 6-to-8-inch-deep raised beds; tomatoes, peppers, and squash need 10 to 12 inches.
  • Raised beds warm up earlier in spring and drain faster, so they suit heat-loving crops like zucchini, summer squash, and peppers better than cool-season crops.
  • You can plant in succession — sow lettuce every two weeks from spring through early fall to harvest continuously instead of all at once.
  • Companion planting (basil near tomatoes, marigolds near squash) can reduce pests and improve pollination in the confined space of a raised bed.

Vegetables that produce heavily in limited space

Raised beds are small, so choose crops that give you a lot of food from a small footprint. Zucchini and summer squash produce dozens of fruits from a single plant over a season. Cherry tomatoes and determinate (bush) tomatoes yield more fruit per square foot than large slicing varieties. Peppers — both sweet and hot — produce steadily all summer in a warm raised bed. Beans, especially bush varieties, flower and fruit continuously if you pick regularly.

Leafy greens are the most efficient use of raised bed space. A 4-by-8-foot bed can produce enough lettuce, spinach, and chard for a household for weeks if you harvest outer leaves and let the center keep growing. Radishes mature in 25 to 30 days, so you can clear them out and replant the same space twice in a season. Peas (both snap and snow) grow vertically on a trellis, so they don't waste horizontal space.

Cool-season crops for spring and fall

Raised beds heat up quickly in spring, which can actually work against you if you want to grow cool-season crops. Lettuce, spinach, kale, and chard bolt (flower and turn bitter) when soil temperature stays above 70°F. Plant these in early spring as soon as soil can be worked, or wait until late summer when nights cool down. In many regions, you can grow cool-season greens through fall and into early winter because the raised bed retains heat longer than ground soil.

Broccoli, cabbage, and cauliflower also prefer cooler weather. Start them from transplants (small plants from a nursery) rather than seeds, because they need 50 to 100 days to mature and you want them to finish before heat arrives. Plant in late summer for a fall harvest, or in very early spring if your last frost date is late enough. Peas grow best when soil is cool, so plant them in early spring or late summer — they'll produce for four to six weeks, then stop when heat arrives.

Herbs that thrive in raised beds year-round

Basil, parsley, cilantro, chives, and oregano all grow well in raised beds and give you fresh herbs all season. Basil is heat-loving and produces more leaves if you pinch off the flower buds. Cilantro bolts quickly in heat, so succession-plant it every three weeks from spring through early summer, then again in late summer. Parsley and chives are cold-hardy and can overwinter in many regions if your raised bed is at least 12 inches deep.

Perennial herbs like oregano, thyme, and sage can live in the same raised bed for years. Plant them at the edge so you don't disturb them when you replant annuals. Mint is invasive and will take over a bed, so grow it in a pot sunk into the soil, or give it its own dedicated bed. Dill self-seeds readily, so one planting often produces volunteers the next year.

Root crops and how deep they need to go

Carrots, beets, turnips, and parsnips all grow in raised beds, but they need enough depth to develop straight roots. Carrots need 6 to 8 inches minimum for short varieties, 10 to 12 inches for full-size ones. Beets and turnips need 8 to 10 inches. Parsnips are long and need 12 inches or more. If your bed is shallower, choose shorter varieties — 'Nantes' and 'Thumbelina' carrots are bred for containers and shallow soil.

Radishes are the exception — they mature in weeks and need only 4 to 6 inches. They're useful for marking rows of slower crops like carrots, because you harvest them before the carrots need the space. Potatoes can grow in raised beds if you mound soil over them as they grow, but they're heavy feeders and will deplete the bed faster than other crops. If you grow potatoes, plan to refresh the soil more often or rotate to a different bed the next year.

Succession planting to harvest continuously

Instead of planting everything at once and having it all ripen together, sow lettuce, radishes, beans, and carrots every two to three weeks from spring through mid-summer. This spreads your harvest across months instead of giving you a glut one week and nothing the next. Cool-season crops like lettuce and spinach can be succession-planted in spring until heat arrives, then again in late summer for fall harvest.

When you harvest a crop, replant the space when ready. Pull out spent lettuce and sow beans. Clear radishes and plant carrots. This keeps the bed productive all season. Keep a straightforward calendar — write down what you planted and when — so you know when to expect harvest and when to sow the next round. A 4-by-8-foot bed can produce three or four different crops in the same space over a season if you plan succession planting.

What not to grow in raised beds

Avoid large, deep-rooted plants. Corn needs 12 inches of soil and takes up a lot of space for the yield. Melons and watermelons sprawl and shade out neighboring plants. Asparagus and artichokes are perennials that occupy the bed for years and don't produce much. Brussels sprouts, while possible, grow tall and take up space for months with little to harvest until late fall.

Avoid planting the same family of crops in the same bed year after year. Tomatoes, peppers, and eggplants are all nightshades and share the same pests and diseases. Brassicas (cabbage, broccoli, kale) share problems too. Rotate families — follow tomatoes with beans or lettuce the next year. This breaks pest and disease cycles and balances nutrient use. If you have only one bed, at least change what you grow each season.

Frequently Asked Questions

Can I grow tomatoes and peppers in the same raised bed?

Yes, they grow well together because they have similar water and heat needs. Plant peppers on the south side where they get full sun, and tomatoes on the north side where they get afternoon shade. This keeps peppers hot and tomatoes from splitting in extreme heat. Space them so they don't shade each other as they grow.

How often should I water a raised bed?

Raised beds dry out faster than ground soil, especially in heat and wind. Check the top inch of soil — if it's dry, water deeply until water drains from the bottom. In summer heat, this may be daily. In spring or fall, it may be every two to three days. Mulch the surface with 2 to 3 inches of compost or wood chips to slow evaporation.

What if my raised bed gets only 4 to 6 hours of sun?

Grow leafy greens, herbs, and root crops instead of fruiting plants. Lettuce, spinach, kale, chard, parsley, and cilantro produce well in partial shade. Tomatoes, peppers, squash, and beans need 6 to 8 hours of direct sun to produce heavily. If you have less, expect fewer fruits and slower growth.

Can I grow the same crop in the same bed every year?

It's better not to. Repeating the same crop depletes specific nutrients and builds up pests and diseases in the soil. Rotate crop families — follow nightshades (tomatoes, peppers) with legumes (beans, peas), then brassicas (cabbage, kale), then root crops or greens. This cycle takes four years and keeps soil balanced and healthy.

Do I need to add fertilizer to a raised bed?

Raised beds filled with compost-based soil start with nutrients, but they deplete faster than ground soil because water drains through quickly. Side-dress heavy feeders like tomatoes and squash with compost or balanced fertilizer mid-season. For leafy greens, a light feeding every three to four weeks keeps production steady. Legumes (beans, peas) actually add nitrogen to soil, so they need less fertilizer.