Jiffy Seed Starting Windowsill Greenhouse - 12-Cell, 36mm Pellets

Watertight Tray-and-Dome Kit for Peat-Pellet Seed Starting, 12-Cell

Starting seeds without a dedicated propagation setup usually means guessing at moisture and warmth with loose potting mix in whatever container is on hand, and germination rates suffer for it. Jiffy's peat-pellet seed starting greenhouse pairs a watertight base tray and clear humidity dome with pre-measured 36mm peat pellets, so adding water expands each pellet into a ready-to-sow growing cell inside a self-contained mini-greenhouse.

This 12-cell kit is sized to fit on a windowsill, giving space-limited home gardeners a full seed starting setup without a dedicated grow area.

Key Features & Benefits

• Pre-measured 36mm peat pellets — expand with water into a complete growing cell in each position, no loose mix needed.
• Watertight base tray — supports bottom watering to keep pellets evenly moist without overwatering individual cells.
• Clear humidity dome — traps warmth and moisture to speed germination in a mini-greenhouse microclimate.
• Biodegradable pellet netting — breaks down in soil, so the whole pellet transplants directly into the ground with roots undisturbed.
• Sized for herbs, flowers, and vegetables — general-purpose seed starting rather than a single-crop kit.

Who Should Use This

This fits home gardeners and hobbyist growers who want a self-contained, no-guesswork way to start herbs, flowers, or vegetables indoors, whether working with a small windowsill setup or a larger batch across more cells.

About Jiffy

Jiffy is one of the heritage gardening brands under Green Garden Products, known for the Jiffypot, a biodegradable peat pot that transplants directly with the seedling inside it. The Jiffy peat-pellet greenhouse kits apply that same direct-transplant, root-disturbance-free approach to a tray-and-dome seed starting format.

Frequently Asked Questions

How much water do I add to activate the pellets

Add water gradually to the base tray until every pellet has fully expanded, which generally takes about 10 minutes and causes each pellet to rise to several times its compressed height. Drain off any standing water in the tray before sowing seeds into the expanded pellets.

When should I remove the humidity dome

Keep the dome in place until most seeds have sprouted and the first true leaves start to appear, venting it slightly as seedlings emerge to reduce mold risk. Remove it entirely once seedlings are a few centimeters tall and ready for full light exposure.

Can I plant the expanded pellet directly into the ground

Yes, this is one of the main advantages of a peat-pellet system. The biodegradable netting and peat break down in moist soil, letting roots continue growing without the disturbance of removing a seedling from a rigid pot.

Can I reuse the tray and dome for another batch of seedlings

Yes, the watertight tray and clear dome can be rinsed and reused for additional seed starting batches. New peat pellets are needed each time, since the originals transplant along with the seedlings and aren't recoverable.

What is the SUPERthrive sample included with some kits for

SUPERthrive is a kelp-based plant vitamin supplement that provides micronutrients to support seedling establishment from the first watering. It's included as a bonus sample with select kits rather than sold as part of the core peat-pellet system.