Best Peat Pellets for Seedlings of 2026

The netting is the reason to look at these at all. Jiffy makes it from cornstarch rather than the plastic mesh on its standard pellets, and that changes transplant day: the plug goes into the ground whole, roots push out through a fibre that breaks down, and nobody crouches over a bed afterwards picking threads out of the soil. We noticed it most with plants that sulk when their roots are disturbed.

Everything else behaves the way a compressed peat pellet should. Warm water and the disc swells into a self-contained pot with a dimple on top for the seed; keep it damp and the roots fill the plug in a couple of weeks. Because the mesh is meant to stay put, there's no fiddling at the far end — a real convenience when you're carrying dozens of starts out to the garden on a hot afternoon and want to be finished.

It's sold as a refill, which suits anyone who already runs a Jiffy tray or strip and just wants fresh pellets each spring. The catch is the pack size. Twenty-five goes fast if you're filling a flat, and per pellet this is the most expensive peat option we covered. For six tomato plants and a windowsill of herbs it's money well spent; for a whole kitchen garden, buy the hundred-count and accept the plastic mesh.

Thirty-six millimeters is a decision most people make without realizing they're making it. It's a middle size — wide enough for a tomato or a pepper to build a root ball before it needs potting on, narrow enough to drop into a standard cell tray without squeezing. Sow thyme or lettuce in one and there's room to spare; sow a squash and you'll be potting on inside a fortnight.

What struck us first was the netting. It holds a soaked plug together while you poke a planting hole with a pencil, and it keeps the medium from slumping when you bottom-water a whole tray. Softer pellets in this group go floppy and lean; these keep their shape, and by the time the roots reach the mesh the plug lifts out in one piece. A hundred in a bag works out among the lowest costs per pellet here, and the discs sit flat and dry in a drawer until you need them, so buying in bulk isn't the commitment it looks like.

The mesh is plastic, and it doesn't vanish in the ground. We plant it for small seedlings and tear the bottom open for anything with a fat root ball, so a swelling stem doesn't get pinched. Germination has been as variable as germination always is — a stalled tray usually means cold, sodden or old seed rather than a bad pellet — but the seedlings that do come up transplant cleanly, and that's the part you're buying.

Before water, these are twelve millimeters thick. A stack of fifty takes less room in a shed drawer than a paperback, which is the quiet advantage of every compressed pellet but matters more here, because this is a small pack you can keep on a shelf and dip into across a season.

Warm water gets them swelling in a few minutes, and they hold moisture well once they're open — a tray of basil or lettuce sits happily without going bone dry or sour. What they don't do is sit neatly. Soaked plugs come out of the bag slightly irregular and rounded at the base, and in a wide cell they'll lean or topple the first time you water from above.

A snug tray fixes it. Drop the pellets into close-fitting cells before you add water, let them swell where they'll stay, then press each base flat with a fingertip; after that they behave like any other plug. Fifty pellets for the smallest outlay in this group is the pack we hand to someone starting their first season, or trying a seed they've never grown before.

Two hundred pellets in a single box is the largest count here, and the arithmetic is the argument. Per pellet this is the cheapest thing in the group — cheap enough that a few duds don't sting — which makes it the obvious buy when you're sowing a cutting garden, a row of sunflowers or a whole bed of zinnias in one sitting.

What that money buys is a smaller, softer plug. At 30 mm these are the narrowest peat pellets we covered: fine for herbs, lettuces and flowers that go out young, cramped for a tomato that wants six weeks indoors. Soaked ones don't always stand on their own, either, and in a loose flat you'll find them on their sides by the second watering.

Give them a tray that does the standing. Drop the pellets into close-fitting cells before you water, let them swell where they'll stay, then press each base flat with a finger — after that they hold. Skip that step and you'll spend the season righting leaning plugs every time you fill the watering can.

Open the box and check it before a sowing day, not after. Pellets that arrive green at the edges or crumbling are a real risk with bulk packs at this price, and a quick sort when the box lands is the difference between a full flat and a patchy one.