Rootstocks & Vigor
USDA/WSU trait table • Site fit still matters
Apple Rootstock Selector by Soil Texture & Stature
Shortlist apple rootstocks by desired vigor, then check drainage, irrigation, replant conditions and support needs.
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How this tool works
The chosen stature sets the candidate class. Soil adds a constraint rather than silently switching a dwarf request to a large tree. Published rootstock size estimates differ by trial, cultivar and growing system. Use regional trial data and the nursery’s exact clone when making a final choice.
Assumptions & Physical Constraints:
Final mature tree height is an approximate range that varies with scion cultivar vigor, soil fertility, and summer pruning.
Full-size tree on loam: the screen returns seedling apple rootstock, not M.9 or G.41. On poorly drained clay, drainage must be addressed before any candidate is treated as suitable.
Found a questionable result?
Report the inputs and expected result. Calculator feedback is reviewed against the cited rule set.
Frequently Asked Questions
Why does M.9 rootstock require permanent staking?
Dwarfing apple rootstocks such as M.9 generally need permanent support. Match the support system to the rootstock, crop load, wind exposure and training system.