Vented Humidity Dome, 2 in, 3-Vent, for 10 x 20 in Trays

Hydrofarm Vented Humidity Dome — 2 in, 3-Vent, for 10 x 20 in Trays

A humidity dome is one of the simplest and most effective tools in seed starting and cutting propagation. By enclosing the tray in a clear dome, you raise ambient humidity and temperature inside the dome — creating the warm, moist microclimate that seeds and cuttings need to germinate and root successfully. The Hydrofarm CK64001 is a 2 in heavy-duty plastic dome designed for standard 10 x 20 in propagation trays, with an adjustable vent system that gives you control over the environment inside.

What sets this dome apart is the patented 3-way adjustable vent design — one vent on top of the dome, and one on each end. Most domes have only a top vent; the additional end vents allow finer adjustment of airflow and humidity without fully removing the dome. This matters during the critical early phases of propagation, when excessive humidity can promote mold while too little humidity can stress seedlings or slow rooting.

Key Features & Benefits

• 2 in dome height — 2 in of clearance above the tray surface — suitable for seeds and small seedlings in standard plug inserts.
• Patented 3-way vent design — one top vent and one vent on each end — adjustable independently for precise humidity and airflow control.
• Heavy-duty plastic construction — durable clear plastic dome that retains moisture and heat for sustained germination conditions.
• Fits 10 x 20 in trays — designed for standard 10 x 20 in propagation trays, including the Hydrofarm Cut Kit Tray and most industry-standard flats.
• Reusable — rinse clean between uses and reuse for multiple propagation cycles.

Who Should Use This Dome

Home gardeners, hobbyists, and small commercial growers starting seeds or rooting cuttings in standard 10 x 20 in trays who want simple, adjustable humidity control without investing in a full climate-controlled propagation system.

When to Vent — Managing Humidity During Propagation

During the first few days of germination, keep vents fully closed to maximize humidity and warmth inside the dome. As seeds sprout and seedlings develop their first true leaves, begin opening vents slightly to introduce fresh air and begin acclimating plants to ambient humidity. By the time seedlings are ready to transplant, the dome can be removed entirely. For cuttings, keep the dome closed until roots are visible, then vent gradually to harden off the new plants.

Frequently Asked Questions

What tray size does this dome fit?

The CK64001 is designed for standard 10 x 20 in propagation trays. It fits the Hydrofarm Cut Kit Tray (CKTRAY) and most industry-standard 10 x 20 in seed flats.

How tall is this dome?

The dome provides 2 in of clearance above the tray surface. This is sufficient for seeds and small seedlings in standard 1-2 in plug inserts. For taller cuttings, consider the CK64081 which provides 7.5 in of clearance.

What is the 3-way vent design?

The patented 3-way vent design includes one adjustable vent on top of the dome and one adjustable vent on each end — three independent vent points. This allows more precise airflow and humidity management than single-vent domes.

Can this dome be used with a heat mat?

Yes. The dome is designed to work with the standard 10 x 20 in Hydrofarm heat mat and similar products. The combination of bottom heat from the mat and retained humidity from the dome accelerates germination.

How do I clean this dome?

Rinse with warm water between uses. For sanitizing between propagation cycles, a diluted hydrogen peroxide solution or commercial propagation tray cleaner can be used. Allow to dry completely before reuse.