Container Gardening Basics

What makes a good container?

Any container works if it has drainage holes, holds enough soil for the plant and is safe for food. Bigger pots hold more water and stay steadier, so match size to the crop. Large plants such as tomatoes need much more room than lettuce or herbs.

Dark pots absorb heat and can overheat roots in summer, while light-colored pots stay cooler. Avoid containers that held chemicals or contain unknown materials. Raise pots slightly so water can leave freely.

Group pots close together so they shade each other's sides and are easier to water. Place them where you pass often so problems get noticed early, and check that the surface under them can handle spilled water and weight.

What should I fill the pots with?

Use a quality potting mix made for containers, not garden soil, which compacts and drains poorly in pots. Mixes drain well and stay light. Some include slow-release fertilizer, so read the label.

Do not fill the bottom with gravel to improve drainage, since it tends to raise the water level in the pot instead. Fill the whole pot with mix, leaving a little space at the top for watering. Replace or refresh the mix each year, since it breaks down and can carry disease.

Buy mix in quantities you can use. Opened bags can pick up moisture and pests, so store them closed and dry. If you reuse mix, remove old roots, refresh it with compost and watch for disease. Ask your extension office whether your mix needs lime or other adjustment, and follow label directions.

• Container potting mix, not garden soil
• Drainage holes in every pot
• Room at the top for water
• Fresh mix each season or well-renewed mix

Which crops do well in containers?

Leafy greens, herbs, peppers, bush beans, compact tomatoes, radishes and some cucumbers and squash do well in pots. Choose varieties described as compact, dwarf or container-friendly. Larger crops need larger pots and sturdy support.

Check the plant tag or catalog for size and spacing. Extension variety trials and container gardening publications list crops and varieties that work well in pots, so use those lists when you can.

How should I water containers?

Pots dry out faster than ground soil, especially in sun and wind. Check daily in warm weather by pushing a finger into the mix. Water when the top inch or so feels dry, and water slowly until it drains from the bottom.

Do not let pots sit in standing water, which suffocates roots. Mulching the surface slows evaporation. Self-watering containers and drip lines help if you are often away. Plan ahead for travel, since a few hot days can kill a pot of tomatoes.

In hot weather, expect to water more than once a day for big plants in small pots. A larger pot is usually the best fix, since it holds more water and buffers swings in heat and moisture.

How do I feed container plants?

Frequent watering washes nutrients from the mix, so container plants usually need feeding during the season. Follow the label of any fertilizer you use, and do not apply more than directed, since too much can burn roots.

Slow-release products and organic amendments are options, and your extension office can advise on feeding for your crops. Watch leaf color and growth for signs of hunger or excess.

Container plants also need light. Most vegetables want direct sun for much of the day, so rotate pots if one side leans, and move them as the sun's path changes through the season.

What problems should I watch for?

Overwatering, underwatering, root crowding, heat stress, blossom problems from irregular water and pests such as aphids are common. Raised pots are less likely to get slugs but are not immune.

Take plants out of trouble quickly: move pots out of intense afternoon sun if leaves scorch, and prune or pot up if roots circle the container. For persistent disease, discard the plant and mix, and clean the pot before reusing.

Check the underside of leaves often for pests, and remove a plant that is clearly diseased instead of letting it spread. Wash your hands and tools before moving between pots.

How do I plan for the season?

Count frost dates like any other garden. Containers can be moved in on cold nights, which lets you start earlier and keep going later. In heat, move them into afternoon shade.

Try a few pots first, learn what you can maintain, and add more once the routine is easy. Clean pots at season's end and store them out of the weather.

Last reviewed: November 12, 2026. Written by the Homestead & Small Farm Editorial Team. See our editorial policy.