Saving Squash Seeds: Learn About Squash Seed Harvesting & Storage

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By Amy Grant

Have you ever grown a blue ribbon hubbard squash or other variety, but the next year the crop was less than stellar? Perhaps you have wondered, if by collecting seeds from the prized squash, you might get another crop just as amazing. What is the best method then of squash seed collection and saving those premium squash seeds?

Squash Seed Harvesting

More and more often of late, plants and seeds available at the local home and garden center are comprised of hybrid varieties which have been engineered to retain selected characteristics. This hybridization, unfortunately, breeds out the plants’ innate ability to adapt to inhospitable or challenging conditions. Luckily, there is a resurgence to save some of our heirloom fruit and vegetable varietals.

Saving squash seeds for future propagation can be a bit of a challenge since some squash will cross pollinate, resulting in something less than appetizing. There are four families of squash, and the families don’t cross pollinate, but members within the family will. Hence, it is necessary to recognize what family the squash belongs to and then only plant members of one of the remaining three nearby. Otherwise, you will have to hand pollinate squash to maintain a “true” squash for squash seed collection.

The first of the four major families of squash is Cucurbit maxima which include:

  • Buttercup
  • Banana
  • Golden Delicious
  • Atlantic Giant
  • Hubbard
  • Turban

Cucurbita mixta counts amongst its members:

  • Crooknecks
  • Cushaws
  • Tennessee Sweet Potato squash

Butternut and Butterbush fall into the Cucurbita moshata family. Lastly, are all members of Cucurbita pepo and include:

Again, back to hybrid varieties, often the seed is sterile or doesn’t reproduce true to the parent plant, so don’t try squash seed harvesting from these plants. Don’t attempt to save any seeds from plants that are afflicted with disease, as this will likely pass to the next year’s generation. Select the healthiest, most bountiful, flavorful fruit to harvest seeds. Harvest seeds for saving from mature fruit towards the end of the growing season.

Storing Squash Seeds

When seeds are ripe, they generally change color from white to cream or light brown, darkening to a dark brown. Since squash is a fleshy fruit, the seeds need to be separated from the pulp. Scoop the seed mass out of the fruit and place it in a bucket with a bit of water. Allow this mix to ferment for two to four days, which will kill off any viruses and separate good seeds from bad.

Good seeds will sink to the bottom of the mix, while bad seeds and pulp float. After the fermentation period has completed, simply pour off the bad seeds and pulp. Spread the good seeds on a screen or paper towel to dry. Allow them to dry completely or they will mildew.

Once the seeds are absolutely dry, store them in a glass jar or envelope. Clearly label the container with the variety of squash and the date. Place the container in the freezer for two days to kill off any residual pests and then store in a cool, dry area; the refrigerator is ideal. Be aware that seed viability decreases as time passes, so use the seed within three years.

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