Growing Zucchini in Pots: A Guide to Success

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Too often zucchini is left out of a small garden because it’s a space hog, but you can make room for summer squash by growing zucchini in pots. These sprawling plants with tentacle-like stems, large leaves, and vibrant yellow flowers make a statement in a container garden. Considering one zucchini plant’s prolific production, by limiting your zucchini planting to a container or two, you may even be able to temper the overproduction that many gardeners, myself included, burden themselves with. Growing zucchini in pots isn’t as common as growing them in ground, so I want to share my tips for success. In this article you’ll read about variety selection, the best soil and containers to use, planting and care advice, and get some help with troubleshooting.

The benefits of growing zucchini in pots

As you’re already reading this article, you probably don’t need to be convinced that growing zucchini in pots is a smart choice. Here are the first benefits that come to mind:

Even gardeners without abundant in-ground growing space can enjoy these favorite summer vegetables.
You can get a jump on the growing season when you sow seeds indoors, directly into their containers.
Zucchini wants at least 8 hours of direct sunlight. You can place your zucchini container in the sunniest spot on your patio, and you can even move it as the sunlight and shade move throughout the season.
I mentioned above that zucchini plants have an interesting size and shape. They make a fun, surprising addition to an otherwise-ornamental container garden.

A guide to growing zucchini in pots — Pick pots that are large enough to accommodate the mature size of the plant and have drainage holes.

To learn more about growing zucchini in pots, watch this video:

Zucchini varieties for growing in pots

The largest, most sprawling zucchini varieties, called semi-bush varieties, grow more like short vines and can take over the patio. More compact zucchini varieties, called bush varieties, are best for containers.

Here are a few varieties of bush zucchini seeds to consider:

Black Beauty zucchini. Ideally suited for containers and known for their productivity
Cocozelle zucchini. Striped Italian zucchini
Golden zucchini. Bright-yellow heirloom zucchini
Ladoga F1 zucchini. A dark-green hybrid zucchini
Round zucchini. Small globe squash maturing in just 45 days (Learn more about growing round zucchini.)

Container size for zucchini growing

Because zucchini plants are so large, selecting a container requires more thought than selecting containers to grow diminutive herbs, such as dill and chives. Look for a container that’s 4 gallons or larger, which would be the same size you’d use for growing tomatoes. You want a broad, sturdy pot that won’t tip over with a heavy plant like zucchini on top.

Just as important as the size is the drainage capacity. Be sure there are drainage holes in the bottom of the container so excess water can run out. Fabic planters are ideal as they come in large sizes and are self-draining.

Growing zucchini plants in pots — Zucchini is a fast-growing vegetable that goes from seed to harvest in about 50 to 55 days.

Which soil is best for container zucchini plants

Most types of well-drained soil mix will suit zucchini in containers. Don’t be tempted to dig up your garden soil. Quality potting mixes are disease- and weed-free. With peat moss (or a peat moss substitute) and either perlite or vermiculite, commercial potting soil is formulated for drainage and aeration; whereas your garden soil is more prone to compaction and may carry weed seeds and squash vine borers’ larvae. Mix in some compost, and fill the container to within 2 inches of the top.

When and how to plant zucchini in pots

Zucchini, like their cucurbit cousins summer squash and winter squash, prefer to be direct seeded, though it is possible to transplant them as seedlings if you’re careful to not disturb their roots. Growing zucchini in pots, you can get a jump on the season by direct-seeding into their pots indoors a month before your average last frost date. Set them outside only after the danger of frost has passed and daytime temperatures are regularly over 70 degrees F (21 degrees C), or bring them back inside when a cold spell arrives.

To help ensure lots of fruits, I hand pollinate my zucchini flowers.

The importance of proper watering

When zucchini is planted in the ground, its roots set out to find water and nutrients. When growing zucchini in pots, you’re responsible for fulfilling the plant’s needs. Water is particularly important, as drought-stressed zucchini plants won’t produce fruit, and uneven watering can lead to blossom end rot.

While you don’t want the soil to dry out at any time, neither do you want to drown the zucchini plant’s roots. Consistent moisture is key, so check the soil daily. In general, the soil will dry out faster in a smaller container, a porous container (such as terra cotta or fabric), and harsh weather conditions (such as wind and high heat). A layer of mulch can help maintain soil moisture and reduce the soil temperature.

summer squash flowers — Female flowers, like the one pictured here, have tiny fruits under the petals. Zephyr is a variety that grows well in pots.

Caring for potted zucchini plants

Adequate water and hours of sunlight are the primary concerns when growing zucchini in pots. You’re probably also wondering about what to do about the sheer size of this plant. It’s possible to tame your zucchini plant by tying it to a stake in the pot, growing it against a trellis, or putting a sturdy tomato cage around it. Forcing the plant to grow vertically, or at least partially vertically, will save some space. Be careful to ensure air circulation around the foliage, which may require careful pruning of some stems and leaves. Powdery mildew is a fungal disease that can set in with too much humidity and too little air circulation.

vegetable growing problems — If pollination doesn’t occur, the small fruits rot and fall off the plants.

Troubleshooting

A primary complaint gardeners make about growing any type of squash is that the plant produces flowers but not fruits. This is often an issue with pollination. Cucurbit family plants have male flowers and female flowers. For a fruit to form, the pollinator needs to visit the male flower first and transfer its pollen to the female flower.

There are two ways to approach this:

Hand-pollinate these flowers yourself, by breaking off the stamen from the inside the male flower and transferring the pollen to the female flower’s pistil.
Companion planting to attract pollinators to your container garden. Companion planting has the added benefits of also attracting beneficial insects, deterring pests, and acting as trap crops. Nasturtiums, for example, can both bring in bees and repel squash bugs.

You can, of course, use both tactics to double your chances of success.

(Find solutions to other zucchini-growing problems in this article.)

growing summer squash in containers — These zucchini plants are so vigorous it’s hard to tell they’re growing in pots!

Final thoughts on growing zucchini in pots

Growing zucchini in pots requires slightly more care than growing directly in the vegetable garden, but nothing about cultivating them as container plants is too foreign. By choosing an appropriately sized bush variety, tapping into zucchini’s consistent watering needs, learning how to work with such a large plant in a container, and paying attention to pollination, you can be sure you’ll have a great zucchini harvest.

Soon the only trouble you’ll have growing zucchini in pots is the need to solve the age-old question of what to do when you can’t eat or give away all the zucchini that your well-tended plants managed to produce.

For more information on growing vegetables in containers, be sure to read these articles: