English Walnut
Juglans regia
Juglandaceae · broadleaf deciduous tree · introduced
Last updated
Plant Profile
Size & Form
Height
40–60 ft
Spread
65 ft
Growth Rate
Fast
Size at 20 yr
25 ft
Lifespan
Moderate
Site Requirements
Light
Full Sun
Soil Drainage
Moist
Soil pH
6.0-7.5
Water
High
Drought Tolerance
Medium
Hardiness
Zones 6b–9b
Ornamental Interest
Bloom Time
May to June
Fall Color
Yellow
Origin
southern Europe to the Himalayas and China
Watch for this season
Fall webwormHigh
Larval Feeding & Web Building
Anthracnose (Shade Trees)Moderate
Active Infection & Secondary Spread
Phytophthora Root RotModerate
Growing Season Stress Expression
Crown GallMonitor
Dormant in Soil
Diseases: Regionally Documented (10)
Discula destructiva (dogwood), Kabatiella and Discula spp... Anthracnose Black Walnut Toxicity Blackline virus Blackline Xanthomonas arboricola pv. juglandis Walnut Blight Rhizobium radiobacter (formerly Agrobacterium tumefaciens) Crown Gall Pseudomicrostroma juglandis (syn. Microstroma juglandis) Downy Leaf Spot Mosses and Lichens Phytophthora spp. (P Phytophthora Root Rot Geosmithia morbida (vectored by Pityophthorus juglandis) Thousand Cankers Disease Pratylenchus penetrans (primary) and P Nematode, Root-lesion
Pests: Regionally Documented (6)
Phenological Calendar
View full calendar (8 stages)
| Stage | Typical Window |
|---|---|
| Bud break BBCH 07 | Feb 15-Mar 15 |
| Leaf emergence BBCH 11 | Mar 1-Apr 1 |
| Bloom start BBCH 61 | Apr 1-Apr 30 |
| Bloom end / petal fall BBCH 69 | Apr 15-May 15 |
| Fruit/seed development BBCH 71 | Jun 1-Aug 31 |
| Fruit/seed maturity BBCH 85 | Sep 1-Nov 30 |
| Leaf drop BBCH 93 | Oct 15-Nov 30 |
| Dormancy BBCH 97 | Nov 15-Feb 28 |
Data Maturity Structured Multiple sources. Expert review underway.