Semi-dwarfing
50% of a seedling tree
HP recommended
Ottawa 3
Ottawa 3 (O.3) · ओटावा 3
About Ottawa 3
Ottawa 3 is a semi-dwarfing rootstock developed in Canada for cold hardiness. It offers good precocity, productivity, and fire blight resistance. Well-suited for high-density orchards in cold regions.
Tree size
Semi-dwarfing — 50% of a seedling tree
DwarfSemiVigorous
Planting
Trees
648–890
trees per acre
Spacing (row × tree)3.5 m × 1.2 m
First cropin 2 years
Productive life18 years
Needs stakes or a trellis
Needs irrigation
Planting notes
Good for high-density plantings in cold regions. Requires staking. Excellent fire blight resistance.
Disease and pest resistance
Collar rot
Tolerant
Woolly aphid
Tolerant
Replant disease
Resistant
Fire blight
Resistant
Burr knot
Not known
Soil and site
AnchorageModerate
Soil depth needed45 cm
Soil pH6–7
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