bottom heat

nounHorticulture.

heat artificially applied to a container in which plants are grown in order to induce their germination, rooting, or growth.

Origin of bottom heat

First recorded in 1880–85

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

After this dressing, the plants needed not to be moved again till they ripened their fruit, unless they required more bottom heat.
The different modes of cultivating the pine-apple | John Claudius Loudon
Mr. Gunter tried to substitute the heat of steam for that of tan, as a bottom heat, but did not succeed.
The different modes of cultivating the pine-apple | John Claudius Loudon
A bottom heat will be necessary when they are repotted, which may be done in about three weeks or a month.
In-Door Gardening for Every Week in the Year | William Keane
Start old and young plants of Clerodendrons, Dipladenias, and Stephanotis, in a sweet bottom heat.
In-Door Gardening for Every Week in the Year | William Keane
To be then favoured with a bottom heat of from 75 to 80, and slightly shaded during bright sunshine.
In-Door Gardening for Every Week in the Year | William Keane

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