How To Grow Summer Squash

Plant Type: Annual
Name: Cucurbita
Light: Full sun to partial shade
Soil Type: Well drained, lots of organic matter
Soil Temperature: 70 – 85°
ph Range: 5.5 – 7.0
Watering: Keep moist
Plant (Payson): May 1 – June 15
Planting Method: Seed or transplant
Germination: 3 – 12 days
Transplanting: plant carefully – do not disturb roots
Maturity (days): 45-65
Common Pests: Squash vine borer, squash bugs, cucumber beetle, Aphid
Common Diseases: Bacterial wilt, downy mildew, powdery mildew, scab, mosaic



Zucchini may well be the most widely known summer squash, but it is by no means the only one. There are also patty pan, yellow crookneck, yellow straight neck, as well as several kinds of zucchini. If you haven’t already tried it, consider yellow zucchini. It is slightly milder in taste and can be more productive. Summer squash is easy to grow and can sometimes produce much more than the average family can consume. Sharing your crop can become a new hobby.

Squash plants have both male and female flowers on a single plant. You can tell the difference because the female flowers have a small bulb at the base of the bud that will become the fruit. Male flowers usually appear first. Bees are needed to pollinate the female flowers with male pollen for the fruit to form.


As soon as the soil can be worked in the spring mix plenty of organic matter into the soil along with well composted manure to create a loose, nutrient rich medium. Add an organic all-purpose fertilizer at the time of planting.
( Click to Read about Fertilizer)


Summer squash is a frost tender annual that needs warmth and cannot tolerate any frost so plant seeds in late May.


Most garden centers will have squash seedlings for sale in early May. Take care to not disturb the roots any more than necessary while transplanting. Put a small amount of organic all purpose fertilizer next to the hole and mix with the soil so that the roots don’t touch the fertilizer. Place plants to the basal roots and firm soil around the plant to hold it upright.


Seeds can be started indoors 4-6 weeks before the expected last frost. Since they grow fast you can also sow the seeds directly into the garden in late May and still have plenty of production. Plant seeds 1 inch deep and lightly firm soil over them. Water thoroughly and keep surface moist until seedlings emerge.



Mulch around the plants once they are well established.


Squash tend to wilt slightly in the hot sun but doesn’t necessarily mean they need more water. They appreciate a bit of afternoon shade. Placing the plants on the east side of the garden with taller plants on the west, can sometimes do the trick. Keep the soil moist, but don’t over water.


Squash are heavy feeders so add plenty of rich compost to the seed bed and feed with side dressings of an organic all-purpose fertilizer throughout the growing season.


Squash plants tend to have large leaves that shade the ground around them, so weeds may not be a problem. A good mulch will also cut down on weed growth.


The most common diseases on squash are bacterial wilt, downy mildew, powdery mildew, scab, and mosaic.

Squash vine borer, squash bugs, cucumber beetle, and aphids. Watch for beetles and remove by hand. Check the underside of leaves for eggs. Remove and destroy them. Throughout the growing season, especially toward the latter half of the summer, watch for aphids. They love squash. You can remove them by spraying with water. If that doesn’t keep the aphids away it may be necessary to use an insecticidal soap, but be careful, squash is very sensitive to soap sprays. Use the mildest solution possible. If squash vine borers are present, slit the stem open with a sharp knife to remove the larva, then place the open stem in wet soil so that it can grow new roots.
Harvest fruit when the outer skin is soft enough to scratch with a fingernail. With summer squash, especially zucchini, big is not always better. Select patty pan when it is about 5 inches diameter and the other varieties when they are about 8 inches long.


Squash is very versatile in the kitchen. It can be boiled, fried, baked, and stuffed; it is great in soups, stews casseroles, etc. Squash can be canned, dried, or frozen or pickled.

 Helpful Links

To aid in your gardening success, here are some useful, trusted links for more information on summer squash.

How To Mulch Your Garden | Types of Mulch - The Almanac

What Is Mulch | How To Use 8 Types in Your Garden - The Spruce

How To Mulch Your Garden In The Fall - The Spruce

Please remember Payson Community Garden is an organic garden. Some of these sites may contain recommendations for non-organic products. Please see this website or Plant Fair Nursery website for a list of recommended products
that meet the organic standards of Payson Community Garden.

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