Seed is both a recurring cost and the starting biological input for every tray. Buying the cheapest bulk bag is not a bargain if germination is poor, the seed is treated for field planting, or the lot creates a food-safety problem.
Look for seed intended for sprouts or microgreens
Penn State Extension recommends high-quality seed with good germination that has not been chemically treated or coated and is specifically marketed for sprouts and microgreens. Their guidance notes that this type of seed should be produced and processed with the intended food use in mind.
Avoid pesticide-treated field seed
Penn State advises avoiding pesticide-treated seed when growing microgreens because seed coats can remain on the young crop and may be eaten. If seed is not sold specifically for microgreens, they recommend organic or otherwise untreated seed.
Buy enough seed to make the economics work
Mississippi State Extension notes that the amount of seed used for microgreens makes ordinary garden packets impractical. Bulk packaging is usually more appropriate once you know you like the crop and can store the seed properly.
| What to check | Why it matters |
|---|---|
| Freshness / lot | Good, even germination is easier with fresh, high-quality seed. |
| Treatment status | Avoid chemically treated or coated seed intended for conventional field planting. |
| Intended use | Seed marketed for sprouts/microgreens is a better fit for food production. |
| Package size | Small packets are useful for testing; bulk reduces recurring cost for established crops. |
| Lot traceability | Lot numbers matter when recalls or supplier notices occur. |
| Storage | Buy quantities you can keep cool, dry and protected before quality declines. |
Seed safety is not theoretical
FDA continues to identify contaminated seed as a source of foodborne illness in sprout investigations. In October 2026, FDA reported a Salmonella outbreak involving broccoli sprouts and microgreens grown from an implicated broccoli seed lot. Consumers and growers were told not to use recalled seed and to clean and sanitize surfaces it touched.
Test before buying the biggest bag
For a new variety or supplier, start with a smaller quantity. Record germination, seed density, crop quality and harvest result before committing to a larger bag.
Next: use the Seed Density Guide to determine how much of that seed belongs on the tray.
Sources: Penn State Extension; Mississippi State University Extension; FDA sprouting-seed guidance and 2026 outbreak notices.
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