Tomatoes, squash and cucumber are all warm-weather vegetables. They have similar cultural requirements and are often grown together in the home garden. All three plants continue to produce fruit until frost kills them off in late fall. These vegetables are usually grown from transplants as they need a long growing season but cannot tolerate spring frost. Grow tomatoes, squash and cucumbers in full-sun, well-draining garden beds and reap a bountiful harvest from mid-summer to fall.
Fill individual peat pots with a moist potting mix. Leave a ½-inch space between the top of the soil and the rim of the pot.
Sow two tomato seeds and one squash or cucumber seed per pot. Sow tomato seeds ¼-inch deep and sow squash and cucumber seeds 1 ½-inches deep.
Cover the pots with a plastic bag. Place in a warm room to germinate. Germination usually takes between seven and 14 days.
Remove the plastic bags once sprouts appear. Place the pots in a sunny windowsill and keep the soil moist but not soggy at all times.
Set the tomatoes, squash and cucumber seedlings outdoors to harden-off one week prior to transplanting. Set the seedlings in a protected area for two or three hours and gradually increase the time outdoors over the course of the week.
Lay a 2-inch layer of compost over the garden bed. Apply a 5-10-10 or similar fertilizer over the bed at the rate recommended on the package. Till the compost and fertilizer into the top 8 to 10 inches of soil.
Dig planting holes to the same depth as the nursery pots and slightly wider. Space tomatoes 15 to 24 inches apart, and squash and cucumbers 2 to 3 feet apart. Space tomato rows 2 to 3 feet apart and space squash and cucumber rows 4 to 5 feet apart.
Tear the top rim off the top of the peat pot. Set the pot in the planting hole and refill around it with soil. Firm the soil in place around each plant with your hands.
Water the bed thoroughly after planting so that it is evenly moist but not soggy. Water one to two times a week as needed to keep the soil moist but not soggy.