Gardening tips for September
The RHS top 10 jobs for this month
1. Divide herbaceous perennials
2. Pick autumn raspberries
3. Collect and sow seed from perennials and hardy annuals
4. Dig up remaining potatoes before slug damage spoils them
5. Net ponds before leaf fall gets underway
6. Keep up with watering of new plants, using rain or grey water
if possible
7. Start to reduce the frequency of houseplant watering
8. Clean out cold frames and greenhouses so that they are ready
for use in the autumn
9. Cover leafy vegetable crops with bird-proof netting
10. Plant spring flowering bulbs
Week 1
- Climbing roses can be pruned once they have finished flowering
- Plant prepared hyacinth bulbs in pots to flower indoors around
Christmas time
- Take semi-ripe cuttings of yew (Taxus baccata) and leave them
to form roots in a cold frame
- Sweet-pea seeds should be ordered now for sowing next month
- Start planting spring-flowering biennials, such as wallflowers
and forget-me-nots, in garden borders.
- Start to ease off on the watering in the greenhouse or you may
start rot that you cannot stop
- Onions that are ripe should be harvested and those remaining
should have their necks bent down to prevent seeding
- Cabbages and lettuces can be planted out for Autumn and Spring
use
Week 2
- Start tidying up for the winter
- Unwanted debris should be put on the compost heap or burnt
- Seeds may be collected and labelled for sowing next year
- Evergreen shrubs and herbaceous plants can now be moved
- Buddleias and Ceanothus cuttings may be struck in the greenhouse
and then transferred to a cold frame to harden off with other
cuttings
- Cut suckers from Calceolarias and Cinerarias and pot up for
next year. Get house plants ready for transfer to the house
- Early varieties of apples and pears that do not keep well should
be gathered
Week 3
- Digging and rotovating should be started whilst the soil is
dry and manure dug in
- Start collecting leaf-mould and mole hills for use round plants
and potting plants
- Rock plants may trimmed back and propagated by division or cuttings
- Start planting crocuses, narcissi, snowdrops in odd number groups
- Broccoli, cauliflowers, onions, radishes and landcress should
be sown for spring use
Week 4
- Lawns may need attention by removing unwanted weeds and sowing
grass seed where needed.
- Climbing plants will need cutting back and securing.
- Dahlias need staking and tying, remove those buds not required
for blooms.
- Next year's Spring flowering seeds need to be sown now starting
with the Hardy Annuals
- Raspberry canes that have fruited should be removed to make
room for the new growth
- Strawberries should have unwanted runners removed to give space
to the main plants
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