1. the root system of a plant, especially one used for grafting
Usage: horticulture
2. a rhizome or underground stem from which new shoots grow
Usage: botany
3. the original source or foundation from which something develops
Usage: figurative

Examples

• The gardener grafted the apple variety onto a hardy rootstock.
• Disease-resistant rootstock helps protect fruit trees from soil pathogens.
• The iris spreads through its thick rootstock underground.
• New bamboo shoots emerged from the established rootstock.
• The family business grew from humble rootstock into a major corporation.
• These ancient traditions form the rootstock of our cultural identity.