SunBlaster 2" Seedling Dome with Vents, 11in x 21in x 2-1/2in deep

A Low-Profile Humidity Dome for Faster, More Even Germination

Seeds and fresh cuttings germinate best in a consistently humid, warm microclimate, which is hard to hold steady in an open room where air moves freely and moisture evaporates fast. SunBlaster's Seedling Dome is made of heavy-duty clear plastic that traps that humidity close to the growing media while still letting light through for photosynthesis to begin.

Two top-mounted, individually adjustable vents let a grower dial airflow and humidity up or down as seedlings progress, and the dome's low 2.5-inch profile keeps it out of the way on a shelf with limited vertical clearance.

Key Features & Benefits

• Heavy-Duty Clear Plastic — lets light through while improving germination and cutting success rates.
• Two Adjustable Top Vents — dial airflow and humidity up or down as seedlings progress.
• Low 2.5-Inch Profile — fits shelving with limited vertical clearance between tiers.
• Fits Standard 1020 Seed Flats — works with SunBlaster trays and other standard 10x20 flats.
• Reusable for Multiple Seasons — built to be cleaned and reused rather than treated as disposable.

Who Should Use This Dome

This dome fits growers starting seeds or fresh cuttings who need a consistent, controllable humidity environment, whether that's a single tray on a home windowsill or a shelf of trays in a commercial propagation area.

About SunBlaster

SunBlaster designs propagation hardware, including humidity domes, trays, and grow lighting, from its base in Langley, British Columbia. Its dome line is built around the same 10x20-inch tray format used throughout the greenhouse industry, so domes and trays from different manufacturers can generally be mixed and matched.

Frequently Asked Questions

How do the top vents work?

The two top-mounted vents are individually adjustable, so a grower can open them partway to release excess humidity or close them fully to hold in moisture and warmth during early germination. Adjusting vent position over the first week or two is the main lever for controlling humidity as seeds sprout.

What tray does this dome fit?

This dome is sized to fit any standard 1020 seed flat, including SunBlaster's own tray line. It isn't limited to a single tray brand or thickness, so it also works with 1020 trays from other manufacturers.

How long does this dome typically last?

The dome is made of heavy-duty clear plastic intended for multiple seasons of reuse rather than single-use disposal. Keep it clean and stored out of direct sun between uses to reduce long-term UV wear.

Why use a humidity dome instead of leaving the tray uncovered?

An uncovered tray loses moisture to the surrounding air much faster, which can slow or stall germination if the growing media dries out between waterings. The dome traps humidity and heat close to the seed while still letting light through, and the vents let a grower dial that humidity level up or down as needed.