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Growing Butternut Squash in Tasmania

Introducing Butternut squash

A delicious warm season crop. These squashes have a deep orange-coloured flesh with a distinct nutty flavour. They like a long, warm summer so start them indoors to make the most of the summer season. They’re easy to grow and produce an abundance of winter squashes which are versatile for cooking and store beautifully.

Classic Mistakes

Make sure your butternuts get enough sun and enough space to grow.


Grow in: Full Sun

In Tasmania, butternuts need as much sun as they can get.

Soil Preparation

Butternuts like a rich soil. Work in plenty of compost and well-rotted manure.

Sowing Seed

Sow seed: September-December
Sowing depth: 10 mm

Start seeds indoors in September or plant them straight into the garden from October or November, once the soil has warmed.

Sow your seeds into mounds about 1 m apart. Keep the soil damp while they germinate. Once the plants are up and established, choose the strongest plants and thin the rest.

Sow your seeds into mounds about 1 m apart. Once the plants are up and established, choose the strongest 2 plants and remove the rest.


Plant seedlings: October-December

Plant seedlings once it's consistently warm and all danger of frost has passed.

Butternut squash tend to do best when planted from seed straight into the garden. They can be planted as seedlings though. Just handle them with care, because they don’t like to have their roots disturbed. Plant them into mounds as you would for seeds and remember to add some bonemeal to each hole and keep the soil moist until they’re settled.


Once your vines reach a desirable length, pinch out the growing tips to prevent them from growing longer. Butternuts can also be grown vertically if space is an issue. Remove any diseased leaves, but remember not to add them to your compost pile.


Butternuts like moist soil. Water them often in the hot, dry summer months. It’s best to try not to get their leaves wet, as they are prone to fungal diseases. If you must wet the leaves, water them in the morning so that the leaves can dry off quickly during the warmth of the day.


Butternuts are heavy feeders and benefit from regular feeding. Feed with a balanced organic fertilizer every 4-6 weeks through the growing season. If the rains are particularly heavy, it might be necessary to feed more often.


Mulching helps to keep the soil moist and cool. Apply a generous layer of organic mulch like lucerne, sugarcane or pea straw. Since butternuts are such heavy feeders, a compost mulch is also a good option, because it’ll keep feeding the hungry vines.


Harvest: 12 to 15 Weeks After Planting

Butternuts can be harvested once their skins have hardened and thickened and the stem is shriveled and woody. Pick mature fruit as you need them. Use a sharp knife to cut them away from the vine. Be sure to leave a piece of stem attached to each butternut. If you want to store your butternuts, only harvest them at the end of summer so that their skins can become hard and thick. Butternuts should be cured before storing.

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