Blackcurrants grow very well in my garden, and I have a particular fondness for them; the very first plant I bought and planted was a blackcurrant bush. It was planted just before by older daughter was born, so the bush is now 15 years old, and still going strong. I get quite heavy yield each year, but it is a battle with the blackbirds as to who gets to eat them.
Blackcurrants are nutritionally very high on the list of super-fruit. They have a particularly high vitamin c content; look here for more details. I also found a good site about blackcurrants, here; absolutely full of detail. I like them because of their tart and sweet flavours, and their amazing colour, both raw and cooked. They are excellent for puddings, pies, jams and jellies, and make a great sorbet.
Blackcurrants are not hard to grow. The first thing is to source healthy plants and to choose a suitable variety. Late-fruiting varieties cope better with our slow spring starts. I think I have Ben Sarek, which do very well for me, with short bushes that are easy to net against birds. Ben Lomond, Ben More, and Ben Nevis are also good choices. I bought mine from a nursery in Inverness, which has since closed. However, I have also bought soft fruit bushes on line, and would recommend Chris Bowers, who sell a good range of plants from ministry certified stocks, which gives you a good chance of getting excellent healthy plants. The Organic Gardening Catalogue can supply organic stock, and also have a good range of varieties. The plants should ideally be 2 years old, with around 3 main shoots.
Blackcurrant bushes need to be planted in reasonably well-drained soil, rich in organic matter, and with shelter from the wind. Mine are behind a wall and a fence. Full sun would be better, but mine are in light shade and doing OK. The best plan is to be well-prepared; dig over your chosen site about a month before planting. Aim to be ready for planting either in November or February to March. You will need to dig over an area about 2 foot square, and add lots of compost, or manure, or well-rotted seaweed.
When your plants arrive, dig a big hole, big enough to spread the roots out across the bottom, and deep enough that the plants are 2 inches lower in the soil than they were in the pot. The old soil mark should be buried. Leave about four feet between plants, and cut back any long stems to the first bud about an inch above the soil. Water in very well, and spread more compost or other mulch around the base.
The first year, you won;t need to do much apart from keep them watered. In future years, there are three main phases: spring mulching, netting and harvesting, and then pruning. In spring, the plants require a good mulching, and the weeds need to be kept down. They also like to be kept well watered, and like a bit of bone meal.
Once the fruit has set, keep an eye on it, and as it starts to develop a colour, you need to develop your bird scaring skills. The best strategy is efficient netting of the plants. I use a fine light-weight nylon net supported on canes and pinned down with bits of wire but from old coat-hangers. Old DVDs and CDs can be used, suspended on wires, to frighten birds away. The cat has proven particularly ineffective as a bird scarer. This year was not a good year; I had a great crop but a beastly bird got under the net after I had not secured it properly, and most of the fruit has gone.
When the fruit is almost all black, wait for a few days before harvesting; if it looks almost ripe one weekend, pick the following weekend. I use scissors to snip off the strigs. The fruit at the top will be the biggest and best for showing off, and tends to ripen first. They keep OK in the fridge, and freeze well. It is a good idea to wash the fruit and remove the stems before storage.
Pruning and taking cuttings is an autumn task. In November, cut out the weedy-looking stems. Once the bushes are over three years old, remove the oldest wood each Autumn, aiming to reduce the bush by about a quarter, and leaving the stems well spaced. It is easy to raise new plants from cuttings at this stage. Take a ten inch cutting from young wood, about the thickness of a pencil, and bury the lower two thirds in the soil in late autumn. This should root easily, and you have a new plant. I have done this more than a few times, as blackcurrants are one of my favourite fruit.