T.O. Plastics Humidity Dome — 50pc — 2 in H — without Vent Holes

Low-Profile Humidity Dome for Seed Germination, 2in H

Freshly-sown seed trays need consistent surface humidity more than they need headroom, and venting at that early stage can let moisture escape faster than germination needs. T.O. Plastics' 2-inch dome keeps a low profile matched to flat seed trays, without vent holes, so humidity stays trapped where seeds are germinating right at the surface.

This low-profile dome is compatible with standard 1020 flats and suited to the earliest propagation stage, where moisture retention takes priority over the headroom a taller dome provides, shipping 50 per case.

Key Features & Benefits

• 2in low-profile dome — matches the shallow headroom needed for flat seed trays rather than taller cuttings.
• No vent holes — keeps humidity trapped at the surface, where moisture retention matters most during germination.
• Compatible with 1020 standard flats — sets directly onto a standard flat without needing a separate adapter piece.
• 50pc per case — supports outfitting a full germination bench in one order.

Who Should Use This Dome

This fits growers starting seeds in flat trays who need consistent surface humidity during germination, before seedlings need the extra headroom and venting of a taller dome.

About T.O. Plastics

Since 1948, T.O. Plastics has manufactured thermoformed trays for the horticulture, life sciences, and industrial markets from its Clearwater and Otsego, Minnesota facilities. The company, part of Otter Tail Corporation, is recognized as one of the top 100 thermoformers in North America.

Frequently Asked Questions

Why doesn't this dome have vent holes?

At the germination stage, retaining humidity right at the seed-tray surface generally matters more than releasing it, since seeds have not yet developed the top growth that benefits from active air exchange. Once seedlings are further along, growers typically move them to a taller, vented dome or remove cover altogether.

When should I switch to the 7-inch vented dome instead?

Switch once cuttings or seedlings need more vertical headroom than this 2-inch dome provides, or once trapped moisture without venting starts to create disease pressure. The taller vented dome is built for that later propagation stage.

Does this dome fit a standard 1020 flat?

Yes, this low-profile dome sets directly onto a standard 1020 flat without an adapter, in line with T.O. Plastics' broader 1020-compatible tray and insert line.

How many domes come in a case?

This dome ships 50 per case. Order enough cases to match your germination bench count.