Break up any packed soil around the plant and add potting loam or another amendment if possible. The USDA Forest Service notes western snowberry planted in potting loam can grow to more than four times the height of snowberry planted in “poor” soil, and the USDA’s Natural Resources Conservation Service notes “clayey” soils are less than ideal. The resulting soil, whatever you use, should be well-drained but not arid.
Give the plant enough water to match your area's normal rainfall for the year. If the year's rainfall is greater than or equal to normal levels, it will be enough for the plant. If there’s a drought, provide enough to match the minimum normal level for your region. The Natural Resources Conservation Service notes western snowberry needs anywhere from 12 to 45 inches of water annually.
Prune the western snowberry plant in early spring. Cutting back the branches will allow new growth to appear without having to compete with older growth for nutrients.