Jump Start 72-Cell Hot House with Heat Mat, Tray Insert and 7.5" Dome

The Jump Start heat mat is designed to raise the root-zone temperature approximately 10°F–20°F above ambient room temperature. For growers needing absolute precision, using a digital temperature controller allows you to maintain the exact thermal conditions required for sensitive species.

Yes. The 17W heat mat is UL-listed and engineered to deliver gentle, consistent heat that will not overheat or damage seedling roots during extended use. Many growers run it continuously throughout the germination phase, which typically lasts several days to two weeks depending on the species.

The 72-cell insert is compatible with a range of starting media including peat pellets, rockwool cubes, and coco plugs. For those looking for high-performance alternatives, you can also use a Jump Start AccelaROOT 50-Cell Insert. Standard seed-starting starter plugs are sold separately.

The 7.5" dome features three adjustable vents that can be partially or fully opened to regulate humidity and airflow. Keep vents closed during germination to maximize moisture retention, then begin opening them gradually once seedlings emerge to reduce humidity and help harden off young plants before transplant.

Yes — the tray, 72-cell insert, and dome function as a standalone humidity chamber. If you don't need the extra height of the 7.5" dome, you might consider the Jump Start Germination Station which includes a 2" dome. In cooler spaces, running the included heat mat makes a measurable difference in germination speed and uniformity.

Yes. The 11" × 22" base tray is fully watertight and designed to hold water for bottom-watering, which encourages roots to grow downward and reduces the risk of damping off caused by overwatering from above. Simply add water to the tray and allow the cells to absorb moisture from the bottom up.