How to Manage Pests
Pests in Gardens and Landscapes
Fertilizing your berries
Blackberries and raspberries require about 1.25 pounds of ammonium sulfate per year, per plant or
0.25 pound of actual nitrogen per year, per plant. Apply fertilizer just prior to an irrigation by
banding the fertilizer out 12 inches from the plant. Apply all the fertilizer in the winter or in
smaller increments during the growing season, with one application in spring, two applications in
midsummer and one more in fall.
In some climate zones, potassium and
phosphorous may be limited and may need to be added to the soil. Soils will need to be tested.
If you use manure, compost, or another source of organic
fertilizer, apply it in the late fall or early winter.
Inorganic fertilizers out of a bag should be spread
over the surface of the soil in the row in early spring
just when growth is starting. If plants lack vigor, apply
additional fertilizer at bloom.