Garden Notes for August 2021.
Laurel is a very useful plant but it is very vigorous and August is the month to keep it neat by trimming your laurel hedge. Some gardeners say that the laurel hedge should be trimmed using secaturs only. This does give a much improved finish, if you have the time. Using shears is much quicker and does not substantially make much difference. If you can allow your compost more than 2 years to compost, then put your laurel trimmings on to it. If, like me, you can only keep the compost heap for a matter of months, it is better to get rid of the laurel leaves since they take a long time to decompose due to their waxy surface.
Dahlias are supposed to be making a come back, having been rejected as being too gaudy. I have always liked them, and wish that I could grow specimens. To even have a chance to have the large blooms, now is the time to make sure that you disbud them, only one flower being kept on each stem. Dahlias will also need to be tied in as their stems become very heavy with the foliage and bloom and are easily broken by gusts of wind.
Cut out old raspberry canes that have fruited this year. Cut them down to ground level and retain only six or seven of the strongest new canes on each plant for fruiting next year. Overcrowding of the canes can lead to a higher incidence of disease.
Spring cabbage can be sown in the middle of the month; good varieties are Pixie, Flower of Spring or Wheeler’s Imperial. Onions that are reaching maturity should have their stems bent over and the bulbs partially lifted with a fork to encourage full ripening. Well ripened bulbs are much more likely to keep right through the winter.
If you have experienced an attack of potato blight, remember that outdoor tomatoes are vulnerable. In the past there were sprays but now it is impossible to get them so the best thing is to remove the affected foliage and burn it as soon as possible.
Planting up strawberry runners in the later part of August will help provide a good crop next year. If you are buying plants in, make sure that they are certified virus-free stock, as strawberries are very prone to virus disease.
Towards the end of the month, rambler roses that have finished flowering should be pruned. Disentangle the growth from the trellis (use gloves for this!) and cut out all the stems that have carried flowers. It is much easier to do this if you untie all the stems before you start the pruning. All the new stems made this year should be retained and tied back into place. You will really appreciate all the work you have done when they flower next year.
Plant Madonna lilies now, with not more than 2″ of soil above each bulb. Order lilies for autumn delivery. Tiger lilies and some hybrids produce bulbils between the leaves and the stem. Gather the bulbils when they fall at a touch and plant them in a deep seed box, about 2″ apart.
Keep shrubs tidy by dead heading. Especially roses, but do not apply rose fertiliser after the end of July, this avoids late soft growth which will not mature before winter.