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Enjoy a year of gardening inspiration with RHS membership!

Join the RHS today and you’ll enjoy free, year-round entry to more than 200 spectacular gardens*, including the four RHS Gardens where you can bring a family guest for free each time you visit. Plus, enjoy exclusive access to RHS Shows, a monthly copy of The Garden magazine (worth £54 per year), personalised gardening advice from RHS experts and much more.

All this is yours from just £44.25 when you pay by Direct Debit.

Join online or call 020 3176 5820 quoting 3938.

*Ts & Cs apply – please see above link for details.

Gardener's Diary


In association with the Royal Horticultural Society

The Royal Horticultural Society

The Royal Horticultural Society is the UK's leading gardening charity dedicated to advancing horticulture and promoting good gardening.

Their goal is to help people share a passion for plants, to encourage excellence in horticulture and inspire all those with an interest in gardening.

In this section on Laterlife they share their expertise to provide your Jobs for the Month - making sure that your garden is ready for the season ahead.

Find out more about how to become a member of the RHS

Jobs to do in September

Late summer progresses into autumn

Top 10 jobs this month

September is generally a cooler, gustier month than August and the days are noticeably shorter. While there's not as much to do in the ornamental garden at this time of the year, if you have a fruit or vegetable patch, you'll be busy reaping the rewards of harvest. It's also time to get out and start planting spring-flowering bulbs for next year and you can collect seeds for next summer's colour too. Make the most of the remaining warmth while you can!


  • Divide herbaceous perennials
  • Pick autumn raspberries
  • Collect and sow seed from perennials and hardy annuals
  • Dig up remaining potatoes before slug damage spoils them
  • Net ponds before leaf fall gets underway
  • Keep up with watering of new plants, using rain or grey water if possible
  • Start to reduce the frequency of houseplant watering
  • Clean out cold frames and greenhouses so that they are ready for use in the autumn
  • Cover leafy vegetable crops with bird-proof netting
  • Plant spring flowering bulbs

Greenhouse cleaning

It may not be the most glamorous of winter tasks but cleaning out greenhouses, gutters and water butts is an important one. Cleaning greenhouses, whether glass or plastic, greatly improves the growing environment for plants. By removing the algae, moss and grime it lets in more light and helps control pests and diseases too.


Quick facts

  • Suitable for Glasshouses, plastic greenhouses, polytunnels, garden frames, gutters and water butts
  • Timing Winter or between crops
  • Difficulty Moderate

When to clean your greenhouse

Greenhouse cleaning is best done with regard to the plants being grown:

  • For summer cropping such as tomatoes: clean in winter when the crop has been cleared
  • For all year round plants such as orchids: clean in mild spells in autumn are best to improve light transmission as winter approaches
  • For periodic and successive crops, raising seedlings for example: clean in periods between crops such as autumn or spring

Cleaning greenhouses, gutters and water butts

Set aside a good day for the task, ideally in dry, calm weather, then;

  1. Remove plants – a sheltered area with fleece protection is a suitable area to hold plants while cleaning is carried out
  2. Brush or vacuum to remove all debris for destruction or removal from the garden
  3. Clean the structural parts with disinfectant or detergent (hot solutions are often best – consult manufacturers directions for use): Hydrogen peroxide based products, often sold for veterinary purposes, are especially benign to users and the environment; Garden disinfectants, such as Jeyes fluid, are satisfactory; Specialist greenhouse cleaners, such as Just Glasshouse Cleaner are also available; Domestic cleaning products may be used
  4. Glazing material should also be washed inside and out, but for plastic materials test on a small inconspicuous area first to be sure the cleaning material does not damage the glazing. Scrub off any old shade paint on the outside of the glass from the summer
  5. Ease out dirt trapped between panes using a flexible scraper such as plastic plant label
  6. Replace broken parts such as vent controllers and draught excluders
  7. Pay attention to propagation areas and equipment. Young plants are especially vulnerable to diseases

Cleaning out gutters and water butts

At the same time as cleaning the greenhouse structure, it is also usually a good idea to clean out other structures such as;


These block easily with detritus so cleaning them out ensures the free flow of water and limits build up of unwanted material in water butts.

  1. Put on a pair of rubber gloves and run your hand along the inside length of gutter
  2. Scoop out any old leaves, moss and other debris that has accumulated
  3. Pay particular attention to the top of fall pipes – these may need unblocking with the aid of a wire coat hanger
  4. Sluice away remaining dirt with a hosepipe or watering can, diverting water to a bucket for disposal around trees and shrubs
  5. Place a wire mesh cap where the gutter meets the fall pipe to trap leaves and other larger debris. Clean this out regularly, especially after leaf fall
  6. Put any debris on the compost heap

Water tanks or water butts

Standing water in butts can become green with algae and may be a source of water borne root rots such as Phytophthora. Uncovered tanks may harbour mosquitoes. Ideally they should be cleaned out once a year.

  1. Drain out any water by tipping the butt on its side to clear dregs and enable access for cleansing
  2. Scrub out the inside of the butt or tank with a coarse brush, if accessible, using a proprietary cleaning product such as Just Water Butt Cleaner or garden disinfectant. Tie a brush to a stick to reach into areas that are otherwise inaccessible
  3. Rinse with clean water
  4. Refill then add a proprietary water butt freshener as directed by the manufacturer. This will help to keep the water clear of algae. As fresh rainwater enters the tank the strength will be diluted and so repeat the treatment from time to time
  5. Water that is discoloured or smelly will not harm plants, although it is good practice to use tap water for vulnerable seeds and seedlings
  6. Fit filters to rainwater diverters to ensure butts are collecting clean rainwater. Old tights make a satisfactory filter where it is not possible to fit more sophisticated equipment
  7. Tight fitting lids that exclude light will help keep butts free of contamination by soil and plant debris. They are also a safety measure for young children and wildlife


Safety: Only attempt to clean gutters and glazing that are safe and easy to reach. Avoid putting your body weight against conservatory or greenhouse glazing. Long handled tools are available for safe working from ground level. Wear eye protection and gloves when handling glass or sharp metal fittings.



The Royal Horticultural Society

Want more Gardening tips?
Why not view the Royal Horticultural Society's website.

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