Yes, growing squash in pots works well as long as you pick a bush variety and give it a wide, deep container. A sprawling vining squash sends runners several feet long and quickly overwhelms a small pot. A compact bush type stays tidy and keeps cranking out fruit right on your patio.
The variety choice matters more than anything else with container squash. Bush plants hold their leaves in a neat clump instead of trailing across the ground. Bush zucchini, pattypan, and compact summer squash all do great in pots. Large winter squash like butternut usually need far too much room and will leave you frustrated.
Pot size is the next big factor. Use a container at least 18 inches (45 centimeters) across so the roots have room to spread and the soil holds enough water through a hot day. A pot that small in width should be about as deep too, since squash grow a wide root mass. The container must have drainage holes in the bottom. Squash roots rot fast in soggy mix, so good drainage protects the whole plant. A clay or fabric pot breathes better than solid plastic and helps spare roots from cooking on hot days.
Fill the pot with a rich, free-draining potting mix rather than dirt dug from the garden. Garden soil packs down hard in a container and chokes the roots. A bagged potting mix stays loose and feeds the plant for the first few weeks. Mixing in a few handfuls of compost gives roots an extra boost as they settle in. Leave an inch of space at the top so water soaks in instead of spilling over the rim. Plant just one squash per pot, because two plants in one container fight over the same water and food and both end up small.
Caring for squash in containers takes a bit more attention than ground beds. Pots dry out much faster, so check the soil every day and water once the top inch feels dry. During a heat wave you may need to water both morning and evening. Aim the water at the soil, not the leaves, since wet leaves invite powdery mildew. A layer of mulch on top of the mix slows down how fast the surface dries. Set the pot where it gets full sun, which means six to eight hours of direct light. Less sun than that gives you a leafy plant with very little fruit.
Nutrients leach out the drainage holes every time you water, so feed your plant on a schedule. A balanced liquid feed every two weeks keeps the leaves dark green and the fruit coming. Once flowers appear, switch to a feed higher in potassium to push more fruit. Watch for pale yellow leaves, since that washed-out look is the first sign your plant has run short on food. A quick dose of liquid feed usually brings the color back within a few days.
One last thing to plan for is pollination. A patio or balcony draws fewer bees than an open garden. Squash needs pollen carried from the male flowers to the female ones to set fruit. The female flowers are easy to spot, since each one has a tiny squash already swelling at its base. If your flowers bloom and then drop off without forming squash, you have a pollination gap. Pick a male flower, peel back its petals, and brush the center against the open female blooms each morning. This quick step often makes the difference between a bare plant and a steady harvest. Do it on a dry morning when the flowers first open, because that is when the pollen sticks best.
Read the full article: Squash Plants: Complete Growing Guide
