Black Walnut | Treated For Thousand Cankers Disease and Not Flagging Since 2008
Black Walnut | Pinnate Leaf Close Up
Black Walnut (Juglans nigra)
Growing to 75’X60’ in a round to oval shape this tree can be a fast growing tree when young and with adequate watering but typically it is a slow growing tree as it matures. It has alternate odd pinnatley compound leaves with 15-23 leaflets. They do very well in most soils and prefer full sun. They do not do well along streets or in compacted soils.
It produces commercially important nuts and the wood is highly sought for fine furniture and veneers. If you don't mind the mess they are excellent landscape trees.
Formerly an excellent shade tree choice. Caution should now be observed before planting this species because of the high susceptibility to Thousand Cankers Disease
Leaf Scorch is an issue when temperature are hot and there is not adequate soil moisture
The major disease to watch for in Black Walnuts is Thousand Cankers Disease. Please read about it here if you have or are considering planting a black walnut.
Powdery Mildew can also be an issue if the spring is cool and wet
Other canker causing diseases and twig blights occur but are less common along the front range.
Aphids are a very common nuisance among Colorado black walnuts.
The walnut twig borer is a major player in Thousand Cankers Disease and should be closely monitored for them.
There are many many cultivars and varieties of walnut. See this page for more details.
Black walnuts have a very rich history as shade trees, food producers and providers of beautiful wood used for furniture, veneers, instrument building and more.
Very common street tree. Wood can be used in furniture and flooring.