It is important to buy only certified stock, wherever possible, to ensure the plants are virus-free and healthy. Healthy plants should last at least ten years before starting to degenerate from virus infection. When this occurs, remove the plants and start a new row in soil that has not grown raspberries or other Rubus species before. Alternatively, re-soil over an area 2 ft wide by 1 ft deep.
should be picked as soon as ripe and, if necessary, every day. The fall crops can be quite heavy.
The cultural requirements (soil preparation, planting, spacing, initial pruning and feeding) are the same as for the summer-bearing kind. Use the parallel wire method of support described on page 25. The fruits are produced when the weather is becoming cooler, so they are best planted in the sunniest position possible, otherwise too few raspberries may ripen before the first frosts arrive.
Pruning established plants Such ever-bearers do not produce a large spring crop. It is better to grow them for fall use only and to put in standard varieties for summer use. Each February cut down all canes in the row to ground level. In the following spring, new canes are produced which crop in the fall. As the canes are not in the row for more than a year, it is not necessary to thin them unless they are particularly crowded. Pull out any which are growing away from the row.
2 In June to September, as new canes develop, tie them 4 in apart on to the wires.
1 In spring, when the new canes appear, cut down the old stumps to ground level.
Second and subsequent years
3 In March, cut the canes to a bud 6 in above the top wire. Mulch the plants
4 In midsummer, fruit is carried on laterals from last year's canes. Thin out the weakest new growth to leave strong canes 4 in apart. Pull out new shoots growing away from the row.
5 When fruiting is over, cut the fruited canes down to ground level. Tie in new canes 4 in apart. If growth is vigorous loop the new canes over to form a series of arches.
6 Each year in early spring, apply 1 oz of sulfate of potash per square yard as a top dressing 18 in each side of the row. Every third year apply 2 oz superphosphate per square yard.
Black and purple raspberries ,are generally known under the name of black raspberry, just as red and yellow raspberries are usually known as red raspberries. They are also closely related to the reds, although they are larger and more productive and greatly tolerant of heat, although less resistant to cold.
Plants with black berries, which are also called blackcaps, ripen earlier than those with purple berries, but purple berries have bigger fruit with a more distinctive flavor. The berries are not as juicy as red raspberries and are used primarily to make appetizing jams and jellies.
Both the black and the purple raspberry grow in zones 4-8.
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