But what is bolting? In a little 2'x2' patch, I harvested close to 10 gallons of spinach in all! Bolting is when agricultural and horticultural crops prematurely produce a flowering stem (or stems) before the crop is harvested, in a natural attempt to produce seeds to reproduce.
What causes Spinach to bolt? Spinach bolts quickly to seed during the long days in late spring or summer. Warm temperatures accelerate this development. Varieties that are "long standing" or slow to bolt are best adapted for spring planting.
I trust these helps and really growing Spinach is very easy and you can grow it in spring and fall!