Winter Pruning of Fruit Trees

  WINTER PRUNING FRUIT TREES AND BUSHES

 The dormant season from November to March is the perfect time to tackle the winter pruning with   pruning saw, loppers and secateurs. Other garden tasks have been put on hold while we wait on better weather once all the snow melts, but pruning is mostly above ground level so deep snow and frost are no obstacle as long as you have warm clothing and the promise of some hot pumpkin or beetroot soup once the job is complete.

Pruning fruit trees and bushes has always been seen as a skill beyond most amateur gardeners and only acquired after good training and years of practice. Even in professional circles I have found great gardeners who never did break down the mystery of pruning. One expert propagator highly regarded for his skills in raising plants never got his gooseberry bushes to bear any fruit.

In reality the principles of pruning are similar for all fruit production although each type has its own needs.

I try to keep my pruning very simple and may not follow the book. I leave that to those undergoing training, who have to follow the Royal Horticultural Society precise methods so they understand the principles and get through their exams.

Then there is the commercial growers who wish to produce quality fruit with high yields, but with the minimum of labour input and aimed at producing trees that can all be picked from the ground.

My methods combine RHS principles applied with a simplified version of commercial practice.

My first aim is to produce a strong well shaped tree or bush, then prune lightly to encourage a balance of fruiting wood and replacement shoots. These must be well spaced to allow light into the tree to ripen up young wood so it can initiate fruit buds.

Pruning also removes weak growth, diseased shoots, crossing branches, branches broken with heavy crops or just too near the ground.

Apples and Pears

 

Pruning method varies depending on whether the trees are bush, cordon, espalier, stepover or fan trained. All of these can be spur pruned by summer and winter pruning. Cut back all side shoots to five or six leaves in mid summer, then again back to two buds in winter to encourage formation of fruiting spurs. In time reduce the size of these spurs otherwise you may get too many fruits at the expense of size.

Leading main shoots are reduced by a third in winter.

My apple and pears are grown as bushes so I do not spur prune them. I carry out replacement pruning of fruiting branches which have got too old and bent down with heavy cropping. This is done with loppers and saw, not secateurs, and I always look for a young shoot to replace the branch being removed.

If the tree becomes too vigorous, I do not feed in spring, but at the end of August. This feed is too late to encourage fresh growth so the tree uses it to build up fruit buds. Late pruning once spring growth has just started will also help to curb an over vigorous tree.

Plums

These are always pruned in summer to minimize the risk of Silver leaf disease. The spores of this disease are around from late autumn to late spring and could penetrate any cut surface.

Form a well balanced tree with five or six main branches in the early years. Plums tend to crop heavy and pull limbs down, so replacement pruning is perfect for them. There is usually plenty of young shoots to replace any limbs removed. Replacement pruning is carried out as required and not necessarily every year.

Peaches

These are usually fan trained against a warm south facing wall or fence, so pruning is carried out to keep the tree in this shape, and allow ample sunlight onto the ripening fruit. Fans have four main branches on each side. These are constantly being replaced by young shoots that are allowed to grow for one year producing new fruit buds that overwinter to make the following years crop. To allow sunlight into the centre of the tree remove all unfruitful shoots in late winter and during summer prune out weak growth, upright shoots and any showing signs of disease. Remove some foliage around the fruit in summer to help colour up the fruit.

Raspberries

Summer fruiting types fruit on canes produced the previous year. These are removed after cropping or in winter and the new shoots tied in. If the variety produces a lot of canes thin these out so that canes are spaced out at four inches apart tied along the top wire with a running knot.

Autumn fruiting types are cut down to ground level every winter as they fruit on new canes.

Blackberry (Bramble)

These are similar to summer fruiting rasps but the canes grow a lot bigger so have to be tied in to a wire framework where they are looped up and down to save space. Train the new canes up the centre and above the fruiting canes to keep them out of the way.

Tayberry and Loganberry is pruned the same way.

Blackcurrants

Immediately after planting cut the new bush down to a couple of buds on each shoot. These prunings can be used as hardwood cuttings to grow into more bushes. Blackcurrants fruit on one year old shoots and older wood. Prune after fruiting or in winter by cutting some older branches down to ground level or to a young shoot coming from near the base. Aim to replace all growth over about four or five years.

Red and White currants

These can be grown as a bush or a cordon as they fruit best on spurs. Allow the bush to form an open centre with about six main shoots. In early summer cut all side shoots to about six inches then in winter further reduce these to two buds. After a few years start to replace one or two main shoots every year with new young shoots.

Gooseberries

These fruit very easily as long as bullfinches don’t go pecking out the buds in spring. Pruning is mainly to make picking easier, so keep the centre open and also remove any low trailing shoots otherwise soil could splash the fruits. Remove any crossing shoots and overcrowded areas.

Saskatoons and Blueberries

Saskatoon  fruit bushes produce berries on all wood, so pruning is only carried out after several years to keep the plant down to an easy height for picking. Every year remove a branch down to ground level to encourage new sucker growth to keep the bushes young.

Blueberries also require little pruning for the first few years as they are quite slow growing. In later years cut some older branches down to younger shoots coming from the base or lower down the plant to rejuvenate the bush.

Grape vines

In Scotland these are either grown under glass or on a sheltered south facing warm wall. Under glass grow them on single upright rods spaced about eighteen inches apart and in winter cut every shoot back to one or two buds of the main rod. Shoots emerge from these spurs and form small fruit bunches. Allow these to grow then prune them to two leaves after the bunch. Then for the rest of the growing period cut all other growths to one leaf. In early autumn thin out more shoots and leaves to let sunshine ripen the fruit. Pruning wall trained vines outdoors is just the same, though grow them on a well spaced framework of main branches rather than rods.

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Preparing for Winter

PREPARING FOR WINTER

Autumn is a very important time in the gardening calendar as it is this time we assess the results of the seasons work so we can plan for the next year. It is also the time to get overwintering outdoor crops tidied up before winter sets in and prepare those requiring winter storage. Then there is the winter digging, fruit tree and bush pruning and before long the leaves will have started to fall.
In fact its quite weird and very unusual, but the seasons seem to be normal. Autumn leaves are falling in autumn instead of early winter, snow is falling at low levels in some places, summer bedding would appear to be finished and the rain has stopped. I cannot remember much wet weather during the tattie picking season, though it was often frosty in the mornings. Then as usual thousands of geese flying in formation overhead are making their way up the Tay estuary. Now, this is autumn.

Allotment work

The cold weather is just what we need to sweeten up the winter cabbage, leeks, kale, Brussel sprouts, swede turnips, Swiss chard and my four parsnips that grew from a whole packet of seeds. Next year I will definitely change the variety and supplier.

Last year I left my beetroot in the ground rather than lift for storage and even though we had a very cold winter they came to no harm, so I will try the same again this year, but earth them up a wee bit to give the roots some protection from frosts.

It is a good idea to try to complete winter digging, adding manure or compost, before the end of the year, but this usually depends on good weather so the soil is not too wet to walk on. Any land sown down to a green manure crop such as mustard must be dug over immediately the first flowers appear otherwise they may set seed and end up being a real nuisance.

Gladioli and chrysanthemums have now finished so they can be lifted and stored for next year. Gladioli are dried off and stored in a cool box in dry sand or dry soil in a frost free shed. Chrysanthemum stools are boxed up and kept moist in a cold but frost free greenhouse over winter.

My strawberry varieties Symphony and Florence have both had three fruiting years, so now is the time to replace them from runners. They have produced a lot of very strong healthy runners so I can afford to give the new strawberry bed on freshly prepared and composted ground special treatment. Rows are spaced three feet apart, but I can afford to make each row a double row six inches apart and space the plants up each row at six inch spacings. This way I will establish a thick row in the first year to give a far heavier crop than traditional planting distances.

Winter Storage

Pumpkins have been lifted, washed and are now stored as an ornamental feature in our utility room where it is not too warm. They will be used fresh for fantastic soups up till next April, then any remaining will have the flesh scooped out and frozen for use later. The seeds will be used for next years crop.

Onions have been dried off and stored in nets hung up in the garage.

Carrots are lifted and stored in between dry straw and covered over with soil to keep them frost free.

Potatoes are now all lifted, dried, sorted out and stored in boxes in a cool but frost free spot.

Apples have now all been harvested, even my Bramleys, sorted out and stored in cardboard trays in the garage. The Discovery variety is finished so now we are eating the Fiesta. Red Falstaff and Red Devil will be stored a bit longer to ripen up.

The freezers are packed with enough fruit and vegetables to keep a large family well fed for well over a year. French beans, broad beans, (it makes a brilliant winter soup) and the best of our sweet corn crop are all frozen and surplus kale leaves get frozen as this makes it easier to break them up for soups without losing any of their nutritional value.

When you add soft fruit to the freezer such as strawberries, rasps, red currants, black currants, gooseberries, saskatoons and brambles it makes sense to pack them in square shaped plastic containers to maximise space and minimise empty air space.

Rhubarb, surplus pears and plums which do not store well can also be frozen to be used throughout the rest of the year.

The latest health trend to use any surplus fruit is in a delicious smoothie. This retains the healthy properties of the fruit or vegetables and can be taken as a food or thick drink. They can also be used in place of cream for summer puddings. Our favourite smoothie at present is made with our Aronia berries. This new berry crop is also called the chokeberry as the fresh fruit is astringent if eaten raw, but easily loses this when cooked. As far as superfood status goes the aronia ranks near the top of the list having ten times as much anti-oxidants as a blueberry. As well as smoothie it makes a great jam and can be juiced for a drink with some sugar added.

Propagation

Geraniums are easily overwintered as rooted cutting taken early in October and put in small pots. Keep them cool and don't over water, but if you wish to build up stock then water and feed oftener and grow in a light warm greenhouse or windowsill. Take the tops out for cuttings as soon as big enough, then take another cutting from the second cutting once it has put on a bit of growth. Grow them fast and repeat the process. It is possible to get ten plants from one plant by late spring.

I will be sowing my Meconopsis, (Himalayan blue poppy) now that it has been in the fridge for three months. It will remain outdoors to complete its stratification period and hopefully germinate in spring.

My saskatoon seed and now Aronia also get stratified before they will germinate. Select good berries at harvest time and squeeze them out of the flesh as soon as possible as the flesh contains germination inhibiting hormones. Wash them and use a kitchen roll to remove the worst of the moisture then store them in moist kitchen roll in the fridge. Do not let them dry out. Sow the seed outdoors in a prepared seedbed or in containers and keep these outside to weather. Germination should occur in spring. However this year my saskatoon variety Smoky has started to germinate. This is October so I do not know if the young seedlings will survive the winter so Smoky will go into my cold greenhouse for a wee bit of protection.

Spring bedding

Now that autumn appears to be with us most of my summer display of bedding plants in beds, tubs and hanging baskets is over. My geraniums are still colourful, so I will leave them alone for another week, and my tuberous begonias still think it is summer. They are still brilliant so no harm will come to them at this stage, even if I have bags of tulips, hyacinths and crocus eager to get planted.

Tubs of begonias will be replaced with a mixture of polyanthus underplanted with scented hyacinths. Smaller pots and hanging baskets will be planted with winter pansies and some crocus, and my main flower beds will be planted with wallflower grown from seed on my allotment, and a mixture of Darwin Hybrid tulips once I finally decide the geraniums are past their best.

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