What to do in your garden during September

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What to plant and sow in the garden in September

What to do in the garden in September

Annuals to plant and sow in September

General garden maintenance to do in September

Sowing now will ensure flowers in summer,
depending on what you sow you can expect
blooms anywhere from 12 to 15 weeks and onward.The following annuals or seedlings can be sown in September:

Sow StreptocarpusPrimula obconica and Begonia seeds in a greenhouse now, for summer flowering.

These annuals or seedlings can be planted out from trays in September:

Planting tagetus croped

Repot pot-bound container plants.

Replant window boxes and cavity walls

  • Try planting geraniums, trailing petunias, nasturtiums, lobelias and Fuchsias.

Start planning the summer garden now.

Water irises regularly, and liliums once a month.

Clean the fish pond.

Remember to dead head annuals and bedding plants regularly and feed every 2 weeks or so with a diluted liquid fertilizer.

Scarify, aerate, fertilize and water lawns thoroughly.

Water and feed hardy summer-flowering annuals regularly.

Pull up spent winter annuals and vegetables and prepare soil for new planting.

Continue to remove weeds from lawns and paving’s.

If your plants are damaged by frost now is a good time to start cutting them back.

Dead, diseased and damaged wood from deciduous trees and shrubs can be removed.

Bulb care in September.

  • Summer and spring flowering bulbs can be fed with bulb food and should be kept moist, but not overwatered.
  • Start watering dahlias; feed day lilies and liliums with a general fertilizer.
  • Water irises regularly and apply a dressing of superphosphate.

Herbs & Vegetables to plant and sow in September

Pruning in the September garden

More permanent crops to plant now in the vegetable garden are globe artichokeschives and rhubarb.

Jerusalem artichoke (Helianthus tuberoses) can also be planted now. They are frost hardy, quick growing, prefer full sun and tolerate a variety of soils. The tuber is edible and the attractive yellow flowers and growth habit make it an effective screening plant.

Garlic can also be planted now, separate and plant them about 75 mm deep in a well drained fertile soil. Remove flowers as they appear and harvest once the foliage turns yellow.

Follow these tips when sowing vegetables during September.

  • Prepare for the summer vegie patch by sowing tomatoesgreen peppersbrinjals and lettuce in seed trays.
    • Water regularly and inspect often until ready for transplanting in about a month to two.
  • Carrots and beans can also be sown now but don’t bother using seed trays they are happily sown directly into the beds.
  • Sow peas directly into the soil during August, sow thickly and thin out after germination, the germination rate is normally high depending on seed quality but beware of rats, mice, birds and the evil cutworm, they easily destroy seeds and young succulent seedlings.
  • Start sowing salad crops now, remember to sow in regular successions to ensure they mature in accordance with harvesting requirements.
  • In warmer or frost free areas plant these veggies in September:
  • In cooler areas plant these veggies in September:
Prune marguerites.Prune the following shrubs if not pruned last month:

Prune Pride of India trees (Lagerstroemias) to encourage flowering.

Cut back, neaten and clean out hedges. Remember to add offcuts to the compost heap.

Prune roses and fruit trees, spray twice with winter-strength lime sulphur.

Prune and shape vines.

Remove dead, diseased and damaged wood from deciduous trees and shrubs.

Now is the time to clean up the tacky trees and shrubs, remove low growing branches, diseased and dead wood and thin out the crown to improve air movement and plant structure.

Remember not to prune spring flowering plants, they flower on wood produced last season and have already set flower buds. Pruning now will not harm the plant but may leave the gardener without those spectacular spring colours.

In colder climates now is a safe time to cut back those deciduous grasses, shrubs and perennials, the killer frost has passed and the dead foliage has completed its deciduous job of protecting the heart of the plant.

Shrubs and Perennials to plant and sow in September

 Pests, Disease and weeds in your September garden

September is a great time for planting almost anything, visit your local nursery or home improvement store and have a look at what’s available.

Clematis can also be planted now, remember they do best with cool soil temperatures.

Now is a great time to plant Camellias. They love a well-drained soil with a slightly acidic soil. Add some pine needles and a good handful of bone meal to the plating hole. Camellias do extremely well in containers so keep this in mind when planting up the patio.

Rhododendrons, also known as Azaleas can also be planted now, but don’t plant them to deep. They produce surface roots which don’t like being buried too deep. Azaleas also make great container specimens.

Give conifers a last good treatment of Aphicide against cypress aphid.

Watch for garden pests early in the season, especially the amaryllis caterpillar.

Treat conifers with Aphicide if cypress aphids are still present.

Powdery mildew may become a problem as damper conditions creep in.

Only spray where necessary to keep the garden free of pests. – There are a number of organic products and remedies available.

Treat fruit trees for pests with a spray. Remember to spray your roses and affected ornamentals as well as many of them harbour pests which attack fruit trees. Particularly spray Pyracantha and quince.

Remove weeds from the lawn by applying a broad-leaf weed-killer, weeds in the garden bed are best removed by hand before they flower and set seed.

Minimise weeds by applying mulch and weed guard or landscape fabric and refrain from turning or “cultivating” the soil.

 Roses to plant in September

 Mulching

Whether it be floribundas, standards or hybrid tea’s now is a great time for planting roses. Make sure you dig large planting holes, add plenty organic matter and a splash of the trusty bone meal. These guys tend to be fussy when it comes to their roots. Remember to water well before and after planting and make sure you have good drainage, roses hate wet feet. Remember to dig the holes nice and deep. Mulch the entire garden well, avoid mulching up against the base of your plants.

Mulching will prevent the soil from losing moisture on hot days in the warmer regions. Mulch is also great for suppressing weed growth.

Mulch the garden now if you haven’t done so last month. In areas with more clay soil apply a layer of 2-3 cm thick and in more sandy regions a 5-8 cm layer is best. Even empty areas still waiting for inspiration will benefit from mulching ensuring a fertile, moist and healthy soil when it comes to planting them up in a few months. Mediums suitable for mulch range from compost to grass clippings, bark chips and dead leaves. Keep in mind a well mulched garden has lower water requirements and less weed problems.

Bulbs to plant in September

 Feeding and Fertilizing your September garden

Plant summer-flowering bulbs, such as arum lilies and flame lilies, that were not planted last month.

Planting in early spring means you can expect flowers from around mid-summer onwards. In colder areas, to be safe, wait till the end of the month to make sure severe frost has passed. Bulbs to be planted now and throughout spring include:

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Feed Camellias and Azaleas.

Feed hydrangeas; mulch and water well.

Feed the lawn once a month; also mow and water regularly.

Give fruit trees their first application of fertiliser, then mulch and water them well.

Feed shrubs, trees and climbers and mulch well.

Feed flowering annuals every 14 days with a water soluble fertilizer like Nitrosol or Multifeed.

Freshen up vegetable beds with fresh compost and organic fertilizer, after harvesting your vegetables and herbs.

  • Liquid fertiliser can be applied every 14 days or so to encourage a heavy yield

Leafy vegetables like spinach and lettuce can be fed with 2:3:2 or a liquid plant food like Multifeed Classic.

Lemon trees can be fed 2 kg (for a mature tree) of 3:1:5 and mulch with compost around the tree.

Summer and Spring flowering bulbs can be fed with bulb food and should be kept moist, but not overwatered.

A dose of 3:1:5 would do your summer-flowering bedding plants well.

 Lift & divide this September

 Indoor plant maintenance

Now is a great time to lift, divide and replant clump forming herbaceous perennials like cannas, dahlias and day lilies. Split the clumps and discard the worn out and centre, division not only provides you with more plants but it stimulates vigorous new growth and often leads to more prolific flowers. Remember to add compost and bone meal to planting holes and water thoroughly.

  • Divide overgrown water lilies and other aquatic plants.
  • Lift and divide perennials that were not divided in autumn.
  • Overgrown Zantedeschias or arum lilies can be lifted and divided now.
  • Daylilies or Hemerocallis can be lifted, divided and transplanted now. Prepare the planting holes well with organic matter or compost and some bone meal.
  • Some advice when dividing perennials:
    • Water clumps well before lifting.
    • Some perennials prefer not to be divided into too small sections as this often leads to a longer recovery period.
    • Don’t lift all the plants to be divided at once, lift them as you divide them to minimise exposure of the roots.
    • Remove and replant the young growth and plantlets from the outer edges and discard older growth in the centre of clumps.
When you water indoor plants make sure the water is room temperature.

With a wet cloth or sponge, gently wipe and dust the leaves every two weeks or so.

Its best to keep your indoor plants away from draughts moving trough the room.

Primulas, cyclamen and cinerarias make great indoor plants, these can be fed once a week and require slightly more water than other now dormant indoor plants.

Single and double flowered begonias as well as flowering Kalanchoes should also be available now.

Avoid getting water on the foliage of African Violets

inddor plants resize

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