1. the root system of a plant, especially one onto which another plant is grafted
Usage: horticulture; agriculture
2. underground stems or rhizomes from which new shoots grow
Usage: botany

Examples

• The apple trees were grafted onto disease-resistant rootstocks.
• Gardeners choose rootstocks that can tolerate poor soil conditions.
• The rootstocks of bamboo spread rapidly underground.
• Wine grapes are often grafted onto American rootstocks to prevent disease.
• These rootstocks will produce stronger, more vigorous plants.
• The nursery specializes in developing hardy rootstocks for fruit trees.