Jiffy Gro-Dome Humidity Dome - 11in x 22in - Greenhouse Effect for Seed Germination

Jiffy Gro-Dome - 11in x 22in Greenhouse Humidity Cover for Seed Germination

The Jiffy Gro-Dome is an 11in x 22in humidity cover designed for use with a standard plant tray to create a greenhouse effect for seed germination. By trapping warmth and moisture above the tray, the Gro-Dome maintains the consistently warm, humid microclimate that gives seeds the best conditions for quick, uniform germination. Used with a seed starting tray and your preferred growing medium, the Gro-Dome is a straightforward tool for improving germination success rates indoors.

Key Features & Benefits

• Greenhouse Effect: The dome traps heat and moisture above the tray, creating a mini-greenhouse environment that maintains more consistent temperature and humidity than uncovered trays in ambient conditions.
• 11in x 22in Footprint: Fits standard 11in x 22in plant trays - a widely used size in commercial and home greenhouse setups.
• Supports Successful Germination: Consistent heat and humidity retention are two of the most important factors in reliable seed germination - the Gro-Dome addresses both by maintaining the environment above the tray.
• Simple Design: No vents or moving parts - straightforward placement and removal during the germination period.
• Jiffy Brand: From Jiffy, a long-established brand in seed starting and propagation products, known for peat pellets, jiffy-pots, and propagation accessories.

Who Should Use This

Home gardeners and growers using standard 11in x 22in trays for seed starting who want to improve germination consistency with a simple humidity cover will find the Jiffy Gro-Dome a practical, no-frills option.

Compatibility

For use with standard 11in x 22in plant trays. Growing medium and seeds not included. Remove dome after seeds germinate and seedlings begin to sprout to prevent humidity-related disease issues.

Frequently Asked Questions

What size tray does the Gro-Dome fit?

The Jiffy Gro-Dome fits standard 11in x 22in plant trays.

Does the Gro-Dome have vents?

The standard Gro-Dome design does not include vents. To increase airflow during seedling hardening, prop the dome at one end or remove it progressively.

When should I remove the Gro-Dome?

Remove the dome after seeds have germinated and seedlings have begun to sprout. Continued dome use after germination increases humidity-related disease risk around emerged seedlings.

Can I use the Gro-Dome with a heat mat?

Yes. Using the Gro-Dome over a tray placed on a heat mat combines bottom heat and aerial humidity retention for optimal germination conditions. Heat mat sold separately.