Black Locust vs Ottawa 3 Rootstock - TreeTime.ca

Black Locust vs Ottawa 3 Rootstock

Robin crab X Malling 9 ((Malus baccata X Malus sylvestris) x Malling 9)

Robinia pseudoacacia

NOT AVAILABLE THIS SEASON - MIGHT RETURN

COMING SOON

(new stock expected: fall of 2025)

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Black Locust

Ottawa 3 Rootstock is the most dwarfing rootstock to come out of the cold-hardy breeding program by the Agricultural Canada Research Station in Ottawa. It produces dwarf to semi-dwarf trees that are 45-55% of standard size. Due to its superior hardiness, it is well adapted to Canadian weather conditions.

It originates from Malling 9 (M.9) and the Robin Crab and is considered more dwarfing than Malling 26 (M.26) and more vigorous than Malling 9. Ottawa 3 Rootstock is very productive and bears fruit early, often requiring structural support when young.

Black Locust is an attractive tree. Its distinctive leaves are made of about a dozen bright green leaflets. It also notable for its fragrant white flowers, which smell of citrus.

Black Locust can grow in many situations, but prefers dry areas with lots of sun. It is robust and is an excellent choice for establishing shade in dry, open areas.

Important note: Much of the Black Locust is toxic to humans and livestock, including seeds, bark, and leaves.

Ottawa 3 Rootstock Quick Facts

Black Locust Quick Facts

Zone: 2a
Zone: 3a
Height: 3 m (10 ft)
Height: 12 m (40 ft)
Spread: 2.4 m (8 ft)
Spread: 8 m (25 ft)
Light: partial shade, full sun
Light: full sun
Moisture: normal
Moisture: dry, normal
Growth rate: medium
Growth rate: fast
Life span: medium
Life span: long
Suckering: low
Suckering: high
Maintenance: medium


Bark: dark reddish brown to balck with furrows
Flowers: Creamy white flowers in a pyramidal shape bloom in may-june
Seeds: dark brown peapod-like pods
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Other Names: o.3 rootstock
Other Names: false acacia, yellow locust