What Is a Seed Potato?

Seed potatoes are tubers grown for planting — not true botanical seed — and certified stock is the safer start.

A seed potato is a potato tuber (or piece of a tuber) sold for planting. Despite the name, it is usually not true botanical seed from a potato fruit. Potatoes are typically cloned from tubers so the next plant matches the parent variety.

Seed potato vs grocery potato

	Seed potato	Grocery potato
Purpose	Grown/selected for planting	Grown for eating
Disease status	Often certified disease-tested	Unknown; may carry latent disease
Dormancy	Meant to sprout	May be treated to resist sprouting
Best use	Planting	Cooking

UMN and Maryland Extension both advise starting with disease-free seed from a certified grower or reputable seller. Last year’s garden tubers and store potatoes can look healthy while carrying pathogens that hurt future nightshade crops.

What “certified” means for gardeners

Certification programs inspect and test seed lots for serious diseases. Buying certified stock is the single best disease-prevention step most home growers can take.

Eyes, pieces, and whole minis

Eyes are buds that become shoots — see potato eyes
Large tubers are cut into seed pieces
Small whole seed potatoes can be planted uncut

True potato seed (TPS)

Potato plants sometimes make tomato-like fruits with tiny true seeds. Those seeds do not reliably grow true to variety and are a different project from standard garden planting. For yield and predictability, use tuber seed pieces.

Next: How to Cut Seed Potatoes or Can You Grow Potatoes From Store-Bought Potatoes?