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Tetsukabuto Winter Squash (F1 Hybrid 90 Days)

Very popular in Japan, this unique winter squash is commonly called a Japanese pumpkin, it develops only a small blossom-end scar. The nearly round, dark green fruit has deep yellow flesh that is so sweet and nutty and smooth and creamy, it's just like custard. It is well-suited for any pumpkin or winter squash recipe, but is especially delicious simply baked and served by itself. Tetsukabuto requires a pollinator, so plant a Hubbard, buttercup, or butternut variety nearby. Tolerant to powdery mildew and vine borers. 

15 seeds


Cucurbita maxima x moschata

Germination: 7-10 days

Germination Temperature: Optimum soil temperatures 70-85ºF

Seed Sowing Depth: 1/2-1" deep

Sowing Indoors: 3-4 weeks before last frost. Provide 70-85ºF soil temperature. Sow 2-3 seeds per cell/pot. Sowing into individual biodegradable peat/cow pots reduces root damage when transplanting. Transplant after last frost, 36-48" apart. 

Sowing Outdoors: Sow after last frost when soil temperature is over 70ºF. Sow a few seeds every 36-48". 

How much does a packet plant: 12-15 foot single row, 3-5 hills

Harvest: Before heavy frost. Determine ripeness when the skin has turned color and becomes dull dry. You will be unable to create a dent when pressing your thumbnail into it. Leave two inches of the stem on the squash and manage carefully so there is no damage which can shorten storage life. Cure for 7-10 days in the sun to harden the rind and increase storage quality. Wipe any debris off skin before storing in a cool dark place with 50-55ºF temperatures and 50-65% humidity.

Tips: Plant in fertile soil, amended with compost or well rotted manure and keep well watered. They benefit from growing on black plastic and by using row covers for weed, insect control, and more rapid growth.

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United States United States
I recommend this product

Doesn't get any better than this!

Purchasing several items and numerous seeds, I could not be more satisfied. The plants propagated from your seeds are amazing. I will no longer look elsewhere. Thank you all! PSB

jeremy g.
United States
I recommend this product

My Favorite Winter Squash

Outstanding. I plant 4-5 varieties of winter squash every year. This is my favorite. Prolific producer. Nutty rich flavor. Stores well. Only minor issue is how tough it is to slice open. Well worth the effort.

Pinetree Garden Seeds Tetsukabuto Winter Squash (F1 Hybrid 90 Days) Review
Nathan H.
United States
I recommend this product

It took over my yard!

Tetsukabuto squashes are amazing and it really covered my backyard. They produce kabocha type squashes that are great in soups. However, you need to be careful to grow a pollinator squash nearby, like hubbard or butternut squash. I made the mistake this year by planting them too close to each other, so the Tetsukabuto out competed the pollinator, but next year I'll do it right.

Pinetree Garden Seeds Tetsukabuto Winter Squash (F1 Hybrid 90 Days) Review
United States

Tetsukabuto winter squash

It is a wonderful squash we grew several times

Scott T.
Sperryville, Virginia

Tetsukabuto Winter Squash

Over the years disease and insects have decimated my annual crops of winter squash. Cucurbita maxima has become all but impossible to grow due to squash vine borer infestations. But tetsukabuto time and again has produced huge crops of wonderfully flavored squash! This cultivar is resistant to disease and vine borers. I am given cause to wonder why it isn't far more popular than it is. It is the main reason that I order from Pinetree Garden Seeds. I highly recommend it to any gardener who loves winter squash as much as I do! Just make sure that you have plenty of room for the vigorous wandering vines. Also, you must plant a c. maxima or c. moschata variety nearby as tetsukbuto's few and far between male blossoms are sterile.