Black and purple raspberries are grown by this method. Suckers are allowed to develop only at the parent plants. The width of the row is also restricted to the parent plants. Plants are spaced 4 to 5 feet apart in the row. Raspberries should be cultivated frequently enough to prevent grass and weeds from developing.
Shallow cultivation is used to avoid harming roots.
Do not cultivate in the fall. This tends to stimulate new growth, which is susceptible to winter injury. Pre-emergent herbicides are useful in controlling weeds within the rows. Princep and Casoron should be used in the early spring before weeds begin to germinate. Specific application concentrations should be matched to the soil type.