How to Grow Spaghetti Squash on a Trellis


Spaghetti squash, one of the common and popular winter squash varieties, grows into a large oval squash with a yellow or orange skin. Most spaghetti squash varieties mature in three to four months. If you lack garden space, grow a vine variety of spaghetti squash on a trellis to conserve soil area. Because the spaghetti squash become quite large as they mature, rig a support system for the growing squash.

Things You'll Need

  • Garden spade
  • Compost
  • Rake
  • Wood or metal trellis (about 6 feet tall)
  • Hammer
  • Vining spaghetti squash seeds
  • Granular fertilizer (10-10-10)
  • Stretchy plant ties
  • Cheesecloth
  • Scissors
  • Sharp knife
  • Prepare a sunny growing location after the final spring frost. Cultivate the soil with the garden spade down to a depth of 6 to 8 inches. Add 4 inches of compost to the top of the soil and work the compost and the soil completely to mix them. Rake the soil surface smooth.

  • Insert the wood or metal trellis system into the soil. Pound the bottom of the trellis into the soil with a hammer to drive it at least 8 inches into the ground.

  • Plant the spaghetti squash seeds along both sides of the trellis, positioning the seeds four to six inches from the trellis. Sow two seeds together about 1 inch deep, spacing the seeds about 12 inches apart. Cover the seeds lightly with soil.

  • Water the seeds generously immediately after planting and keep the soil moist while the seeds germinate – about one to two weeks. Provide water for the growing spaghetti squash plants if less than 1 inch of rain falls in a one-week period.

  • Thin the seedlings when they reach a height of 4 inches. Remove the weakest seedlings to leave one plant growing every 12 inches along the trellis.

  • Apply the fertilizer to the seedlings by sprinkling 1/4 lb. of granular fertilizer for every 10 feet of seedlings. Apply the fertilizer approximately three weeks after you see the first blossoms and work the fertilizer into the soil well with a hand rake.

  • Pull weeds as they appear, to keep the soil area free of competing plants.

  • Tie the vines to the trellis with the stretchy plant ties to train the vines. Support the main vines by tying them loosely to the trellis.

  • Cut a 2-foot length of cheesecloth for each spaghetti squash that begins to grow on the plants. Tie the cheesecloth so it acts as a sling for the squash and tie the ends of the cheesecloth to the trellis.

  • Harvest spaghetti squash before the first autumn frost, when the skins turn yellow. The skin should feel firm to the touch. Use a sharp knife to cut the squash from the vines, leaving about 3 inches of vine protruding from the squashes.

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