Getting it to bloom

Why won't my Spaghetti squash bloom? (and how to make it flower)

Also called vegetable spaghetti, noodle squash (Cucurbita pepo).

About Spaghetti squash

Cucurbita pepo · also called vegetable spaghetti, noodle squash · edible

Spaghetti squash is a winter squash whose cooked flesh separates into long noodle-like strands. Vining habit and 90-100 days to harvest. Easier than butternut and pet-safe.

A Cucurbita pepo cultivar (same Americas-domesticated species as acorn and delicata) whose ripe flesh separates into pasta-like strands.

Plant type: edible

Sources: extension.illinois.edu, johnnyseeds.com

The reasons spaghetti squash isn't blooming

Almost every non-blooming spaghetti squash traces back to one of these, roughly in order of how common they are:

Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.
Too much nitrogen feed, driving lush foliage at the expense of flowers (very common with general or lawn feeds).
Heat or cold stress at flowering, or poor pollination, so flowers form but drop without setting.
Irregular watering — drought or waterlogging at the budding stage makes buds abort.
It is still too young or was checked by a transplant and is rebuilding before flowering.

Feeding spaghetti squash a high-nitrogen general feed and growing it in too little sun — you get a big leafy plant and almost no flowers.

The fix — how to get spaghetti squash to flower

Maximise sun. Give spaghetti squash the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers.
Switch the feed. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.
Help it set. Keep moisture steady, avoid temperature extremes at flowering, and encourage pollinators (or hand-pollinate) so flowers turn into fruit.
Water consistently. Keep moisture even through budding and flowering — drought-then-flood swings make buds drop.

Light and feeding do most of the heavy lifting here. Dial in the spot with the light guide for spaghetti squash and get the feeding right with the spaghetti squash fertilising schedule — the wrong feed (too much nitrogen) is one of the most common silent reasons a healthy plant makes leaves instead of flowers.

Bloom season and what to expect

Spaghetti squash flowers through its warm growing season and, with good pollination, follows each flush of flowers with the crop — expect a steady run rather than one burst.

Post-bloom care so it flowers again

Keep feeding and watering steadily so flowering and fruiting continue; remove tired or diseased growth to keep energy going into new flowers.

For everything else this plant needs day to day, see the full spaghetti squash care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Spaghetti squash blooming — frequently asked questions

Why won't my spaghetti squash flower?

Spaghetti squash flowers (and then fruits) on the current season's growth — it needs full sun, warmth, steady moisture and a switch to a lower-nitrogen, higher-potassium feed once it starts to flower. The most common reason it is not happening: Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.

How do I make spaghetti squash bloom?

Give spaghetti squash the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.

When does spaghetti squash normally bloom?