Growing Peppers in Pots of 5 Gallons or More

What size pot does a pepper need?

Give each of your plants a pot of at least 5 gallons, 12 to 18 inches deep, with a hole in the bottom. UW–Madison Extension puts peppers with tomatoes and eggplants in that size class¹, and UMD Extension sets 5 gallons as the minimum for peppers². The pot band at the top of this page shows how the sizes step up: a dwarf variety can live in 4 to 6 gallons, and Maryland gives a full-size plant 8 to 10 gallons on its own³.

Size matters to you because the pot is your plant's whole water tank. A small pot holds less water, so your plant runs dry sooner on a hot afternoon.

15 gallons minimum¹²212–18 inches deep¹3Mix all the way down; no rocks or shards in the bottom¹4A drainage hole¹5Full sun, 6 hours a day or more¹

1. 5 gallons minimum¹²
2. 12–18 inches deep¹
3. Mix all the way down; no rocks or shards in the bottom¹
4. A drainage hole¹
5. Full sun, 6 hours a day or more¹

The bottom of the pot is where you can go wrong without knowing it. Fill the whole pot with mix and skip the gravel layer: water drains best through one continuous column of mix. UW–Madison cites research showing that layers in a container hold water back instead of letting it out¹, and Maryland says rocks, gravel or pot shards in the bottom do not improve drainage³.

If you reuse a pot, it can carry root rot from last year. The same UW–Madison guide rinses old pots, soaks them 30 minutes in 10 % bleach and rinses again, and warns that this does not always work on plastic¹.

Which kind of pot should you pick?

The one with a hole, in a light color, that you can lift. UW–Madison lists 5-gallon buckets, plastic pots, plastic storage boxes, clay, ceramic, wooden barrels and grow bags as fine for vegetables¹; each one changes how often you water.

For a sunny balcony, a light-colored plastic pot or a bucket gives you the most slack between waterings. On a cool, shaded patio, a clay pot that dries faster can suit you better.

Here are the three pots from that table, each with what to expect at the tap.

How much potting mix do you need?

A 5-gallon pot takes about two thirds of a cubic foot of mix. UW–Madison gives the bag sizes as 1, 2 and 2.8 cubic feet, which hold 7.5, 15 and 21 gallons¹; the bag chart on this page divides that volume by 5.

Here is the sum for two setups you might have. Four 5-gallon pots need 20 gallons, which one 2.8 cubic foot bag covers with a gallon to spare; six pots need 30 gallons, which is exactly two 2-cubic-foot bags¹. Buy for the pots you have.

For every pot you fill, use potting mix, not garden soil. Commercial mixes are light, high in organic matter and drain well, and a pasteurized one lowers the risk of soil-borne disease¹. If the label lists no fertilizer, UW–Madison suggests adding a slow-release one when you fill the pot.

The Millennial Gardener walks through growing peppers in containers in five steps, so you see the whole job in one sitting before you buy a pot, while the sizes and watering on this page stay the sourced ones.

Play video: Grow The BEST Peppers In Containers In 5 Easy Steps 15:28

Grow The BEST Peppers In Containers In 5 Easy Steps

From The Millennial Gardener

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How heavy is a filled pot on your balcony?

Light if you fill it with potting mix, and about seven times heavier if you fill it with garden soil. UMD Extension puts high-quality soilless mix at about 10 pounds per cubic foot and garden soil at about 75⁵. A 5-gallon pot holds about two thirds of a cubic foot, so it weighs roughly 7 pounds with dry mix and 50 with soil.

Water adds to every figure in the table, because the mix holds it, so treat these as the lowest weight your pot reaches. If you plan to line up several pots on a balcony, ask your landlord or building manager what load the floor carries.

Which peppers grow best in containers?

The compact and dwarf varieties fit your pots best. UW–Madison Extension names thirteen of them for containers⁶, shown as chips in the variety band on this page; three of them are hot: Cayennetta, Mariachi and Red Chili.

For your first pot, shape counts as much as size. NC State's Onslow County office says long, thin peppers are easier to grow in pots than big bell types⁷, so a cayenne or a slim chile is the easier first pot if you want heat. The hot pepper plants hub gives each variety's season and height before you choose.

Ornamental peppers give you another route. UF/IFAS says they stay 10 to 20 inches tall and fruit from May through fall, and some are edible but very hot⁸.

How often do you water peppers in pots?

Little at first, then every day in summer. UW–Madison Extension says small plants need little water, but once they grow, the weather warms and the fruit sets, container peppers need watering daily¹. A 5-gallon pot holds a fraction of the water a garden bed does, which is why your fruiting plant on a sunny balcony in July can need the hose every day.

Two small habits help your drainage. Maryland raises pots on pot feet or a brick, and empties the saucer after every watering³.

Can mulch cut how often you water a pot?

It takes some pressure off, but it will not end the daily soak. UMN Extension says that, depending on the pot's size and material, you may water more than once a day in hot, dry weather, and that you usually water at least daily¹⁰.

Mulch slows evaporation, keeps the roots a little cooler in hot sun and stops soil from splashing onto the leaves, where splash can carry plant pathogens up from the soil¹⁰. UMN suggests herbicide-free grass clippings or burlap, or straw or hay if your pots are large, and says shredded newspaper or coconut coir may also work. It adds that mulch does not suit every pot, so try it on one pot first. The watering guide covers how mulch changes the schedule in a garden bed.

How do you feed peppers in pots?

Start with food in your mix, then feed lightly and often. If your bag lists no fertilizer, UW–Madison mixes in a slow-release one at filling time¹. Penn State's PlantVillage feeds peppers a liquid fertilizer at planting and every two weeks after¹¹, a rhythm that suits a pot because you water it so often.

Ease off the nitrogen once your pods form. UF/IFAS cuts the nitrogen when fruit starts⁸, and a pot plant that keeps getting leaf food turns into a tall green bush that sets fruit late¹².

Why do potted peppers run out of food between feeds?

Because every watering washes some of it out of the bottom. UMN Extension says repeated watering leaches nutrients even from a mix that holds slow-release fertilizer, and it starts regular feeding between two and six weeks after planting, depending on the mix, how often you water and how fast the plant grows¹⁰.

Two habits cut the loss. A soluble fertilizer dissolves at once, which UMN calls a good fit for pots where root room is tight and frequent watering carries nutrients away. And you can split the dose:

The saucer matters too. A saucer that stays full leaves the mix waterlogged, and UMN says saturated soil loses nitrogen to bacteria that turn it into gas, so dump the saucer after you water¹⁰. A mix that stays soggy has bigger problems than lost nitrogen, and the overwatered peppers page shows them.

Where should the pot go?

In full sun, where you can move it when you need to. UW–Madison puts container plants in at least 6 hours of sun a day and points out that pots can move to follow the weather¹. That makes a pot the safest home for your slowest peppers: on a cold spring night you carry it in, and UMN Extension brings seedlings inside when nights drop below 55°F¹².

Your peppers can also live indoors under lights or in a bright window, which the guide to growing peppers indoors covers.

What goes wrong with peppers in pots?

Most of your pot problems come back to water: too little room for it, or no way out for it. Find what you see on the left.

Setting up your first pepper pot

Get these six things right before planting day.

Your potted plant still runs on the outdoor calendar. Keep it inside or under cover until nights stay warm, then move it out on the date the guide to when to plant peppers gives for your frost date; from then on, the daily soak is the job that decides your harvest.