How Deep Should A Container Garden Be? (100 Plants List)

This was a question that I thought a lot about when starting my container garden. Each plant that you grow needs the soil to be deep enough for its roots.

A container garden should have depth depending on the plants you grow in it. 6″ to 8″ deep for leafy vegetables such as spinach, lettuce. 8″ to 14″ deep for root vegetables such as carrots, radishes. 12″ to 16″ for large, fruiting vegetables such as tomatoes, eggplants, peppers.

I’ll help you determine which containers you should pick for growing your plants based on their depth. I’ll also give you a long list of vegetables, fruit, and houseplants with the container depth you should use.

Why it’s important to give plants sufficient depth?

Plant roots are like fingers reaching down into the ground. They’re constantly searching for water and nutrients. If they don’t have access to these things, they won’t grow well.

Roots will only reach as far as the topsoil is thick enough to support them. The deeper the root system grows, the more food it gets from the surrounding area. This means that if you want healthy growth, you must provide plenty of room for the roots to spread out.

On average, doubling pot size allowed plants to grow 43% larger. – Science Daily

Why should you avoid giving plants too much depth?

It’s important to ensure the roots get the required depth in the container. But you don’t want to overdo this and use a container that is deeper than required.

This will make you use a lot of potting soil than is required. You need to spend more money than required due to this.

If the container contains a lot more potting soil than required, the roots may not be able to absorb all the moisture you provide. This will keep the potting soil moist for a lot longer, and you risk overwatering the plant.

Overwatering can cause fungal issues like root rot that can damage the roots and destroy the plant.

How deep should a container be for leafy vegetables?

Leafy vegetables such as lettuce require less depth than other types of vegetables. These include vegetables like lettuce, spinach, and kale. I’ve also included herbs like cilantro, mint, and lavender in this list.

You can provide 6-12 inches of depth in the container or growing bag, and they will grow just fine. You can grow several of them in a single container. You could even grow different leafy vegetables in the same container.

Here is a list of some leafy vegetables and the required container depth.

Plant	Container Depth (inches)
Arugula	12
Bok Choy	8
Cabbage	12
Celery	8
Chard	6
Chicory	18
Collards	12
Kale	12
Lettuce	6
Mustard Greens	6
Orach	12
Sorrel	8
Spinach	6
Swiss Chard	8
Cilantro	8
Basil	8
Lavender	12
Rosemary	12
Thyme	6
Sage	8
Mint	12
Parsley	8
Dill	12
Fennel	12
Chamomile	8
Tarragon	12
Oregano	8
Marjoram	6

How deep should a container be for root vegetables?

Root vegetables need a lot more container depth than leafy ones because their roots will grow deep into the soil.

Some of them, like turnips or beets, may need less than others, but on average, you need to grow them in a 6-24 inches deep container. I’ve also included tubers like potatoes and pods like garlic in this list.

You can grow different types of root vegetables in the same container if it’s large enough to give space for each of them.

Leave 3-4 inches of space between each plant, and adjust according to the seed package directions. (bhg.com)

Here is a list of some root vegetables and the container depth you should use.

Plant	Container Depth (inches)
Beets	8
Carrots	12
Garlic	8
Horseradish	24
Jicama	12
Leeks	18
Onions	10
Potatoes	15
Radishes	12
Rutabaga	12
Scallions	6
Sweet Potatoes	18
Turnips	8
Chives	8
Lemongrass	8

How deep should a container be for fruiting vegetables?

These types of vegetables tend to need the most container depth. They have deep roots and grow tall, so they need this depth.

You need to provide a container with 8-12 inches depth for growing fruiting vegetables such as tomatoes, peppers, cucumbers, and eggplants. I’ve also included vegetables like asparagus and Brussels sprouts in this list.

You should not grow different fruiting vegetables together because they will compete for nutrients and moisture, affecting growth.

Here is a list of some fruiting vegetables that you can grow and the container depth they need.

Plant	Container Depth (inches)
Asparagus	12
Beans	8
Broccoli	8
Brussels Sprouts	12
Cauliflower	8
Corn	12
Cucumbers	12
Eggplant	12
Endive	6
Kohlrabi	16
Okra	10
Peas	8
Peppers	10
Pumpkins	20
Rhubarb	20
Squash	12
Tomatoes	12
Zucchini	12

How deep should a container be for houseplants?

Houseplants can vary a lot in their size, and you need to find out the depth requirements for each plant.

The good thing about houseplants is that you can grow them in any decent depth container, which will do fine. That’s because you’re not expecting edibles from them.

You will do fine if you pick a container between 8-12 inches deep when growing houseplants.

Do use your judgment to figure out how deep the container should be. Small plants like succulents could do just fine in containers with less depth, such as 4-6 inches.

If you’re growing flowering plants, you should note that perennials will need deeper containers than annuals. That’s because their roots grow deep into the soil to survive for years, unlike annuals.

Here’s a list of some houseplants you may grow and the container depth you can use.

Plant	Container Depth (inches)
Anthurium	8
Croton	12
Orchid	6
Pothos	10
Red Aglaonema	6
Snake Plant	10
Peace Lily	10
Succulents	4
ZZ Plant	10
Ponytail Palm	8
Chinese Evergreen	8
Grape Ivy	8
Philodendron	12
English Ivy	8
Spider Plant	6
Hoya	8
Rubber Tree	10
Cast-Iron Plant	8
Jade Plant	12
Weeping Fig	8
Asparagus Fern	6
Chinese Money Plant	6
Yucca	10
Air Plant	6
Aloe	4
Dragon Tree	12
Calathea	10
Bromeliad	6
Kalanchoe	6
Crown Of Thorns	8
Christmas Cactus	6
Schefflera	10

How deep should a container be for fruit plants?

You can grow some fruits in containers, such as strawberries, blueberries, and even figs.

But some of the fruiting plants grow into trees, and even if you grow some dwarf ones in the container, they could require a lot of depth.

You may need a container 8-48 inches deep if you want to grow some of the fruiting plants and trees.

Here are some fruit plants and the container depth you need for growing them.

Plant	Container Depth (inches)
Melons	16
Strawberries	8
Blueberries	24
Pineapple	24
Cantaloupe	16
Watermelon	20
Currants	20
Gooseberries	18

Difference between a container and grow bag for plant depth

You can use either a container or a grow bag to grow your vegetables, houseplants, and fruits. The benefit of using grow bags is they are lightweight, inexpensive, durable, and allow the roots more breathing space, so they don’t get root-bound.

The grow bags have a thin boundary compared to containers. They also tend to hold more potting soil than containers. This means you can use less potting soil in a grow bag than in a container.

It would be fine to use 1-inch less depth in a grow bag compared to a container. That would be sufficient to meet the depth requirements of the plant.