Bigtooth Aspen

Populus grandidentata

Salicaceae · broadleaf deciduous tree · native

Last updated March 8, 2026

Quick Facts

Height

50–70 ft

Growth Rate

Fast

Light

Full Sun

Soil

Wet Tolerant

Water

High

Hardiness

Zone Zones 3a–9b

Bloom Time

Apr 1-Apr 30

Origin

Nova Scotia to Ontario and Minnesota

Bacterial BlightHigh

Spring Infection Period

Cytospora CankerHigh

Spring Canker Activation

Leaf BlisterHigh

Spring Spore Germination and Infection

Oystershell scaleHigh

Crawler Emergence

+ 8 more — see full disease and pest lists below

Phenological Calendar

Stage	Typical Window	What to Look For
Bud break BBCH 07	Feb 15-Mar 15	Buds swelling and beginning to open; first green tissue visible
Leaf emergence BBCH 11	Mar 1-Apr 1	First leaves fully unfurled on new growth
Bloom start BBCH 61	Apr 1-Apr 30	First open flowers visible; flowers yellow
Bloom end / petal fall BBCH 69	Apr 15-May 15	Last petals falling; flower structures fading
Fruit/seed development BBCH 71	Mar 15-May 31	Fruit or seed structures forming; fruit color: brown
Leaf drop BBCH 93	Oct 15-Nov 30	Leaves yellowing and dropping; no significant fall color display
Dormancy BBCH 97	Nov 15-Feb 28	Leafless; no active growth; dormant buds set

Diseases: Regionally Documented (17)

Marssonina Leaf Spot Uredinales (rust fungi) Leaf Rust Taphrina spp. Leaf Blister [VERIFY] Leaf and Shoot Blight Symptom category — not a single disease Canker Pseudomonas syringae pv. syringae Bacterial Blight Armillaria spp. — primarily A Armillaria Root Rot Daldinia concentrica Aspen Trunk Rot Ceratocystis fimbriata (black canker); Cytospora notastro... Black Canker (Target Canker) Cryptosphaeria punctata Cryptosphaeria Canker (Snake Canker) Cytospora spp. (Valsa spp., Leucostoma spp.) Cytospora Canker [VERIFY] Ink Spot Sooty-bark Canker Rhizobium radiobacter (formerly Agrobacterium tumefaciens) Crown Gall Multiple obligate biotrophic fungi (Erysiphales: Erysipha... Powdery Mildew Septoria Leaf Spot and Canker Sclerotinia spp. White Mottled Rot

Pests: Regionally Documented (14)

Malacosoma spp. Tent caterpillar Leucoma salicis Satin moth Various (Coleoptera, Lepidoptera) Borer Pemphigus populitransversus Poplar Petiole Gall Aphids Lepidosaphes ulmi Oystershell scale Prionoxystus robiniae Carpenterworm Phyllonorycter apparella Aspen leaf blotch miner Euhexomyza schineri Poplar twiggall fly Aphidoidea Aphid Acanthococcus azaleae Azalea bark scale Hyphantria cunea Fall webworm Edwardsiana rosae Rose leafhopper Various (Gracillariidae, Agromyzidae) Leaf blotchminer Pemphigus bursarius Lettuce root aphid

Data Maturity

Structured Multiple sources. Expert review underway.