free stock; compatible rootstock
Horticultural term for a rootstock that is compatible with a scion in grafting. Used in plant propagation contexts.
この品種には共台としてマルバカイドウがよく使われる。
For this variety, Malus prunifolia is often used as a compatible rootstock.
Compound of 共 (とも, 'together, shared') and 台 (だい, 'stand, base'), referring to a shared or compatible base for grafting.