Singing the Praises of Butternut Squash

butternut squashbutterbush squash

by Debbie Piesen

Winter squash may be the perfect vegetable. It is easy to grow, stores well without processing, is tasty and nutritious. For seed growers like us at Living Energy Farm, winter squash has the added advantage of being a dual-purpose crop- we can save the seed while also enjoying the bounty of delicious food.

We grow all kinds of different squashes on our farm, but moschata type winter squashes are our favorite. Moschata is a species of squash that includes seminoles, butternuts, and some pumpkins. Moschatas do particularly well in the Southeast because they are resistant to insects and thrive on heat and humidity. One of our worst insect pests is the squash vine borer, which in a bad year can wipe out non-resistant varieties. The reason mochatas resist vine borers is that they have solid stems, unlike the hollow stems of pepo and maxima type squashes. With a moschata, the vine borer has no place to go!

Pictured, from left to right: top row: Butterbush, Nutterbutter, Waltham, Waltham Virginia Select; bottom row: Honey Nut, Metro PMR, Amber Delight

Among the moschatas, butternuts stand out as particularly productive and delicious. This year we were involved with trialing seven different butternut varieties- Waltham, Waltham Virginia Select, Metro PMR, Butterbush, Nutterbutter, Honey Nut, and Amber Delight. Waltham is the standard butternut squash for its medium-large size and good flavor, but Waltham Virginia Select, which will be offered by Southern Exposure starting next year, proved to be a considerable improvement over Waltham in productivity and disease resistance.

Our all-around favorite was Butterbush, which has exceptional flavor, early and uniform ripening, and a small seed cavity. This variety has compact and productive vines which are well suited to the home grower, who may have limited space.

In addition to being fun and easy to grow, butternuts are excellent keepers. Without canning or freezing, we enjoy our butternuts from harvest in September well into February and March. Good handling and storage technique starts at harvest time. Ideally, harvest your butternuts when you have a week of warm clear weather. Choose fruits that are fully mature and unblemished for storage. Immature or damaged fruits, or fruits missing their stems, will wrinkle or rot more quickly in storage and should be eaten first. Start by clipping the fruits off the vines, leaving at least an inch of stem, and turning the fruits so the stem is exposed to sun and wind. Leave the fruits in the field, or move to a sunny spot, to cure for at least a week. The curing process dries out the stem and draws moisture from the squash, which hardens the rind and helps prevent rot during storage. If the weather is cool or wet when you harvest, squashes can be cured in an indoor space at 80-90 degrees Fahrenheit.

Once the squashes are cured, pack them gently into a box or bin, being careful to avoid puncturing the skin. You don’t need a root cellar to store winter squash; in fact, they do better with warmer temperatures and medium humidity. They should not freeze- 50 to 65 degrees Fahrenheit is ideal- but we find that in Virginia butternuts do fine in unheated outdoor buildings like sheds and barns until the weather turns really cold in late December or January. After that, a basement or cool room in the house works nicely.

Our favorite way to eat butternuts is to slice them in half lengthwise, coat them with oil, sprinkle the halves with cinnamon or savory herbs, and bake them at 350 degrees for about an hour. Some folks like to add a little molasses or honey, but some varieties like Butterbush don’t need the extra sweetness, they taste better without it.

And nothing says winter in our kitchen like a warm, hearty squash soup. We sometimes make squash soup from the frozen purees we’ve put up from our fall pumpkins, which are not good keepers. But using storage squashes like butternuts works well too, and many of us – myself included – prefer the flavor to pumpkins. Here is our favorite squash soup recipe. The quantities have been left out because it works for many different amounts of vegetables, as long as there’s plenty of squash!

Butternut squash
onions or leeks
celery or celeriac
grated ginger
salt and pepper

Bring a large saucepan full of water to boil for stock. While the water is heating, slice open the squash(es) lengthwise. Scoop out the seeds and pulp into the saucepan. Peel off the skin and add it to the saucepan. Cut the squash into one inch cubes and set aside. Slice, dice, or mince, according to your preference, the onions or leeks, celery or celeriac, and garlic. Add any trimmings to the stock pan. Keep the stock at a slow boil for at least one hour.

Coat a large heavy-bottomed pan with olive oil, put on medium heat. Add onions or leeks and cook until they begin to soften, then add the garlic, celery or celeriac, and squash. Cook for about ten minutes. Then add the stock through a strainer, adding extra boiling water if necessary to cover, and the grated ginger. Cook at a low boil for 30 minutes, until the squash is soft. Mash it all up or put through a blender. Add cream as desired, and salt and pepper to taste. Yum!

It’s easy to save seed from butternuts and other winter squash. Cultivation is much the same as growing these plants for food. Give them plenty of space and adequate water for quality seed. To maintain genetic vigor, save seed from a population of at least 10 to 20 plants. And be sure to provide at least a quarter mile of isolation distance from other varieties of the same species. (SESE recommends a quarter mile to one mile of isolation, depending on planting size.) Harvest when the fruits are completely mature. Signs of maturity are different in different varieties, but with butternuts look for fruits that are completely tan. Cut a few fruits open and check the seeds if you’re not sure; they should be plump.

To save the seed, cut the squashes in half with a small knife, trying not to cut through the seed cavity. Scoop out the seeds, pulp and all, into a bowl or bucket. Add a small amount of water, if necessary, so the seeds stay wet while they are fermenting. Let the seeds ferment for at least two days, stirring twice a day. The fermentation process controls some diseases and breaks down the pulp so it is easier to clean the seed. You may need to let them ferment for more than two days in cold weather. When the pulp is soft enough to slip easily from the seeds, add more water to the bowl or bucket. Most of the good seeds will sink, and most of the pulp and immature seeds will float. Pour off the pulp and immature seeds. Repeat to separate out more of the pulp and immature seeds, adding more water with each pour if necessary. Then pour out the good seeds onto a screen and put them in front of a fan to dry. After 5 to 7 days of drying, put the seeds in a jar and store them in a cool dry place until you’re ready to plant again in the spring!

Debbie Piesen has been working in organic agriculture for eight years, and has been growing organic vegetable seeds for Southern Exposure Seed Exchange for three years. She is currently the farm manager for Living Energy Farm, a community and environmental education center in Louisa, Virginia, that uses no fossil fuels. Living Energy Farm cultivates three acres of organic vegetables, grains and flowers for seed and market, and maintains five acres (and growing) of organic orchards.

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