T.O. Plastics Humidity Dome — 25pc — 7 in H — with Vent Holes

Tall Vented Humidity Dome for Larger Cuttings and Seedlings, 7in H

A humidity dome sized only for freshly-sown seed can crowd cuttings and taller seedlings before they are ready to come out from under cover, and a sealed dome with no venting traps excess moisture that can invite damping-off. T.O. Plastics' 7-inch dome gives larger cuttings and seedlings the headroom to grow under cover, with vent holes that let excess humidity escape rather than build up unchecked.

At 1,148 cubic inches of growing space and compatible with standard 1020 flats, this tall dome suits propagation stages where plants need both extra vertical room and controlled venting, shipping 25 per case.

Key Features & Benefits

• 7in tall dome — gives larger cuttings and seedlings enough headroom to grow under cover.
• Vent holes — let excess humidity escape instead of trapping moisture that can encourage damping-off.
• 1,148 cu in of growing space — provides more interior volume than a low-profile dome.
• Compatible with 1020 standard flats — fits directly onto standard flat trays without an adapter.

Who Should Use This Dome

This fits growers propagating cuttings or seedlings that have outgrown a low-profile dome's headroom, or where controlled venting matters more than maximum moisture retention.

About T.O. Plastics

T.O. Plastics has focused on thermoformed nursery and greenhouse trays since 1948, running two manufacturing facilities in Clearwater and Otsego, Minnesota. Now owned by Otter Tail Corporation, the company reclaims plastic resin at scale and applies that material across its horticultural tray and insert lines.

Frequently Asked Questions

Why does this dome have vent holes instead of sealing completely?

Vent holes let excess humidity escape rather than condensing and trapping moisture inside the dome, which can create conditions favorable to damping-off and other fungal issues. Controlled venting is generally more important once cuttings or seedlings are further along than at initial seed sowing.

When should I use the 7-inch dome instead of the 2-inch dome?

Use the taller 7-inch dome once cuttings or seedlings need more vertical headroom than a low-profile dome provides, typically later in propagation than initial seed sowing. The 2-inch dome is better suited to flat seed trays where moisture retention right at the surface is the priority.

Does this dome fit a standard 1020 flat?

Yes, this dome is built to fit standard 1020 flats directly without an adapter, matching T.O. Plastics' broader 1020-compatible tray and insert line.

How many domes come in a case?

This dome ships 25 per case. Order enough cases to match your propagation bench count.