Genus guide
Juglans — 15 species
Juglans are stately, long-lived deciduous trees cultivated worldwide for their rich nuts and valuable timber. Varieties such as English Walnut 'Chandler' and 'Franquette' demand full sun — six to eight hours daily — and deep, well-drained loamy soil with a pH of 6.0–7.5; young trees need regular irrigation but become drought-tolerant once established. All Juglans species are toxic to cats and dogs: hulls, wood, and mouldy nuts contain juglone and related compounds that can cause serious neurological and digestive harm.
All Juglans species we cover
- Black Walnut
- Black Walnut 'Sparks 147'
- Black Walnut 'Thomas'
- Butternut
- English Walnut 'Chandler'
- English Walnut 'Franquette'
- English Walnut 'Hartley'
- English Walnut 'Howard'
- English Walnut 'Lara'
- English Walnut 'Pedro'
- English Walnut 'Serr'
- English Walnut 'Tulare'
- Heartnut
- Japanese Walnut
- Manchurian Walnut
Juglans — frequently asked questions
Are Juglans plants toxic to cats and dogs?
Most Juglans are not pet-safe. Of the 15 Juglans species in the Growli library, 15 (100%) carry a toxic or mildly-toxic ASPCA classification and 0 are pet-safe. Always confirm the exact species on its pet-safety page before trusting it around cats or dogs.
How much light do Juglans plants need?
Most Juglans do best in direct sun. If yours stretches toward the window or loses its variegation it wants more light; scorched or bleached leaves mean it is getting too much direct sun.
Are Juglans easy to care for?
Some Juglans suit more experienced growers — several want strong light, sharp drainage or a specific seasonal rhythm. Check the individual species page for the exact regime.
How many Juglans varieties are there?
Growli's care library covers 15 Juglans species and varieties — browse them all above. They share a similar light, water and soil pattern, so once you learn one Juglans, the rest follow closely.
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