Yellow crookneck squash is a summer vegetable, grown during the frost-free season of any location. The difference between summer squash and fall or winter squash is that it is harvested at an immature age, before the rind becomes hard. This type of squash is a huge producer. In fact, just a few yellow crookneck squash plants will produce enough for your family, neighbors and co-workers.
Choose a full sun location. Work the garden soil, where your yellow crookneck squash will be planted, with a shovel and/or pick. Mix in compost. If you have a clay soil, add a bit of sand. Summer squash prefers a nutritious, well-drained soil. Use a pH soil tester (found at garden centers) to make sure your soil is at a level between 5.5 and 6.8.
Wait to plant your yellow crookneck squash until three or four weeks after the last frost, when the soil has warmed. Create mounds of soil about 2 feet across. Use your hoe to dig a moat around the hill.
Use four to five seeds for each mound. Poke holes at the top, 2 inches deep and three inches apart. Drop a seed in each hole and cover it with soil.
Water the mounds lightly with a sprinkler hose attachment. Also, fill the moats with water about once a day. Keep the mound soil moist until the yellow crookneck squash seeds germinate.
Thin the squash seedlings when they are 2 to 3 inches tall. Keep the strongest, healthiest-looking plants and cut the others, at ground level. If you pull the weaker seedlings, you may disturb the healthy plants.
Water the yellow crookneck squash about once a day. When the plants are stable (strong and secure in the ground) you may begin watering by the moat, alone. All types of summer squash need lots of water, so don't let them get too dried out. Give the plants extra water during hot, dry periods.
Fertilize your squash plants in midseason. Depending on the variety of crookneck squash you have planted, it will take 50 to 65 days from planting to first harvest. Mix a low-nitrogen fertilizer into the moat with water, according to the amount recommended by the manufacturer.
Place each squash on a small piece of wood as it begins to grow, to keep ground insects away.