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Hormone rooting powder
A chemical compound used in the propagation of plants. Proprietary brands contain hormones needed to promote root cell development, as well as mineral nutrients and trace elements.
Hose-in-hose
An abnormality, giving a flower the appearance of a flower within a flower. Also known as cup-and-saucer formation.
Humus
Decomposed organic matter that provides nutrients for plants and increases the soil's ability to retain water. Humus can be mixed with garden soil and sand to make a potting mixture.
Hybrid
Term used for the plant resulting from the cross fertilisation of two or more plant species or genera.
Hybrid vigour
The increase in the desirable characteristics of a hybrid plant, eg, in growth rate or yield, in comparison with its parents.
Pagination for glossary terms starting with the letter "h"
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