Walnuts do best in areas with full sun and deep well-drained
soils (4–6 feet at least). Avoid planting in sites
that stay wet, such as frequently irrigated lawns, flower
beds or soggy, wet soils. Avoid sandy, high-clay, or
shallow soils. Walnuts are adapted to areas with moderate
chilling hours--500 to 1,000 hours below 45° F. Because
of the early blooming habit of walnuts, avoid planting
where late-spring frost occurs, Where late frost does
occur, expect that crops will be light in some years.
If you are planting on a site where soil is shallow because of hardpan, break through the hardpan
when preparing for planting. Do not plant trees too close together, as this may cause poor growth.
low areas that accumulate water