Growers construct these low enclosures over a deep layer of fresh manure mixed with straw. As the manure composts, it releases steady, gentle heat upward through a layer of topsoil. This traditional method allows horticulturists to germinate seeds and force early vegetable growth weeks before the ambient soil temperatures rise.
Shovel another foot of fresh horse muck into the base of the hot bed so we can get the early brassicas started.
The manure must be packed down tightly and allowed to vent its initial extreme heat for a few days before sowing, or it will cook the seeds.
Also heard as
- hotbox
Related terms
Cold frame
A low, transparent-roofed box set on the ground to protect plants from freezing weather.
Bottom heat
Gentle warmth applied directly under seed trays or plant cuttings to encourage root growth.
Forcing
The horticultural practice of artificially manipulating a plant's environment to induce out-of-season blooming or fruiting.