Coast of Maine Sprout Island Seed Starter | 16qt - OMRI Listed

OMRI Listed Seed and Cutting Starter Mix, 16qt

Seeds and cuttings are unforgiving of a growing medium that's too rich, too poor, or too heavy, which is why Coast of Maine built Sprout Island specifically for the germination and rooting stage rather than adapting a general potting mix. It blends sphagnum peat moss, kelp meal, perlite, worm castings, and well-aged compost, with mycorrhizae included to support early root development.

This 16qt bag is OMRI Listed and ships ready-to-use, with no rehydration or amendment needed before starting seeds or cuttings.

Key Features & Benefits

• Blended for Germination — Sphagnum peat, kelp meal, perlite, and worm castings support young seedlings.
• Contains Mycorrhizae — Supports early root development from the start.
• Ready-to-Use — Ships uncompressed with no rehydration or amendment needed.
• Natural Aeration and Moisture Retention — Balances air and water for tender young roots.

Who Should Use Sprout Island

Gardeners starting seeds or rooting cuttings who want a dedicated, ready-to-use organic mix rather than a general-purpose potting soil will find Sprout Island suited to that stage.

About Coast of Maine

Coast of Maine has built organic soil blends since 1996 using ingredients sourced locally around Maine and New Brunswick, distributing them through independent garden centers instead of big-box retailers.

Frequently Asked Questions

What is Sprout Island made from?

It blends sphagnum peat moss, kelp meal, perlite, worm castings, and well-aged compost. Mycorrhizae is included as well to support early root development.

Does this mix contain mycorrhizae?

Yes, mycorrhizae is blended in specifically to support root development at the germination and rooting stage. That's part of why it's formulated separately from Coast of Maine's general potting soils.

How is Sprout Island used out of the bag?

It ships ready-to-use with no rehydration or amendment needed before starting seeds or cuttings. Growers can fill trays directly from the bag.

Why use a dedicated seed starter instead of regular potting soil?

A general potting soil can be too rich or too heavy for tender seedlings and cuttings just getting established. Sprout Island is blended specifically for that early stage, balancing aeration and moisture retention instead.