Preserving an heirloom variety of seeds is a simple task and, with each growing season, you have an opportunity to replant a vegetable you have enjoyed for years without alteration. When planting heirloom squash seeds, ensure the source of your seeds is reliable so you truly get heirloom seeds. Once you have your seeds, planting them is similar to planting any squash seeds and, within two to three months, you'll be eating fresh summer or winter squash right from your own garden.
Choose how many squash plants you need using the rule of 1 to 2 plants per household member. You'll need approximately 3 to 4 feet of space between each plant in a row, with your rows spaced 4 to 5 feet apart.
Base the size of the garden bed area you'll need on the spacing and number of plants you want to grow. Prepare the garden bed area where you want to plant your squash seeds by loosening the soil up to 10 inches deep.
Use the hoe to pull the soil up into small hills at each point where you want to plant following the spacing guidelines of step 1. Plant 2 to 3 seeds at each hill 2 to 3 inches deep and cover over.
Saturate the soil fully around the seeds, and keep the hill well saturated as the seeds germinate and the plants begin to grow. Avoid wetting the foliage of your growing plants by watering near the soil basin around the hill well enough that the roots inside the hill can draw it up.
Water the plants well throughout the season and harvest squash when it is ripe by cutting it directly off the plant with a sharp knife. Use gloves because many squash plants can be quite prickly and somewhat painful to exposed skin.