Charlton and Blackheath Amateur Horticultural Society

Plants of the Month: The annuals (September 2025)

If your own space is looking ‘a bit green’ at the moment, think about adding annuals to liven up your garden in 2026. Here are a few I highly recommend:

Zinnia

This year I’ve grown Zinnia elegans SPRITE MIXED at my allotment and they are looking good – tall, healthy, robust, colourful and bee-friendly. I am very pleased with them, as the flowers themselves are a mixture of vibrant and subtle shades, and, as an added bonus, no signs of stem rot (fungi/bacteria more prevalent in warm, wetter summers that attack the stems).

I sowed the seed straight into the soil in two rows. Two or three weeks later, I thinned the seedlings and replanted those thinnings into a third row. So, they are tightly packed and they don’t seem to mind that and I don’t need to stake them. Flowering from July to October, this robust variety is perfect for displaying in gaps in borders or containers. And ideal for picking, although I don’t have the heart to do that yet!

Pat’s 10 jobs for September 2025

1. Well at last the rain has arrived and is ready to drown all our plants! You may need to empty those saucers you put under pots for some of your more tender plants before they drown or rot…

2. This month and next is a good time to cut down and split many perennials ready for our sale at the Horn Fair on 19 October which soon comes round. I split sedum and Hesperantha the other day. I needed two forks back to back but made about fifteen plants! Check which plants are suitable for splitting in Autumn as some are better done in Spring.

3. Increase your supply of Pelargoniums by taking cuttings now below a leaf node. It also provides insurance for next year. We always love unusual varieties for the sales table if you can spare them.

This Aeonium will not like sitting in a saucer of water! — Don’t let your pots drown! Geranium clump ripe for division, and Pelargonium cuttings

A clump of Geranium macrorrhizum ready for division — Don’t let your pots drown! Geranium clump ripe for division, and Pelargonium cuttings

A visit to Hidcote

Hidcote Manor has existed in one form or another for centuries, but the present garden was only established in the early twentieth century when Lawrence Johnston bought the property at auction on behalf of his mother and the two moved in in 1908, adapting the house to suit their requirements. Having been farmland for much of its history, Johnston had a blank canvas on which to begin work. He was a keen plantsman and went on plant-hunting expeditions himself – today Hidcote’s plant collection still contains many species regarded as of national importance, and many gardeners will be familiar with Lavandula angustifolia ‘Hidcote’ and Rosa ‘Lawrence Johnston’.

What we bring to the table

Class 17 (‘photograph of a display of plants on a table’) in our recent Flower, Fruit and Vegetable Show was partly inspired by Vija’s ‘Fantasy Garden Tables‘ post in May, which in turn was inspired by Monty Don’s ever-changing and covetable table displays on Gardeners’ World. Members’ photographs were displayed and judged on a digital screen, and were so varied, lovely and interesting, we thought we’d show them here (click on images to see in more detail):

Class 17 2025: a display of plants on a table

August/Autumn Show 2025

The 2025 Autumn ‘Flower, Fruit and Vegetable Show’ was held on Monday 18 August in the Old Library at Charlton House.

As it is usually held in September, there were some adjustments to the range of classes. It was a well attended and lively show, and our fears that perhaps there would be fewer entries – due to the date change or the fact that we have had such a long period of drought – were unfounded. In fact, across the 18 classes there were 150 entries and we had to extend the show tables!

As this year is a special one, in which we celebrate the 75th anniversary of CABAHS, there were a couple of ’75th anniversary’ themed classes, and we were delighted to welcome as judge Jillian Smith, long-time CABAHS member and Chair of the Society, and now joint Vice President with Ron Roffey. Jillian has a long experience in judging shows over many years and has a beautiful garden in Winn Road, which was opened to the public on a number of occasions to raise money for charity.

Plants of the Month: The Oranges! (August 2025)

Rosa glauca garland, with hips — Rosa glauca adorning a pergola

After a brilliant summer, autumn is not too far away and this is when we start to notice more and more orange-flowered plants and berries becoming features in gardens and parks. Orange is a warm and comforting colour, and I’ve listed three that you might be interested in:

Pat’s 10 jobs for August 2025

1. Time to trim back lavender hard if it has finished flowering, but try not to cut into the old wood. If you’re lucky you may get a few late flowers.

2. And time to give that Wisteria and Campsis a hack back by removing all the whippy growth and tidying up for the autumn.

This lavender will need a cut back soon. — Promote flowers by cutting back and watering in good time.

Camellia flowering in Spring. — Promote flowers by cutting back and watering in good time.

3. Azaleas. Camellias and Rhododendrons are making their flowers for next year and need regular water at their roots or they’ll drop their buds and have no spring blooms.

A visit to the Old English Garden in Battersea Park

Pergola cathedral.
Old English Garden, Battersea Park, July 2025

A group of enthusiastic members visited the Old English Garden in Battersea Park last weekend, led by Ruth, who worked there for Thrive, during the period during which it was transformed from a rather overgrown historic site to an award winning and inspirational garden reimagined by a well-known designer.

The original garden was designed by JJ Sexby in the early 1900s and renovated a couple of times in the 1960s and 1980s, during which the lily pond was drained and filled with bedding schemes, the hard landscaping changed to crazy paving and then to the current brick pavers, and the splendid Wisteria pergola deteriorated.

Old English Garden with sundial and Wisteria pergola. Battersea Park, July 2025

Old English Garden. Battersea Park, July 2025

‘Unearthed: the Power of Gardening’

I visited the ‘Unearthed: The Power of Gardening‘ exhibition (on until Sunday 10 August 2025) at the British Library recently, the third gardening-related exhibition at a non-garden-related institution that I’ve seen in the past few years (I’m sure there have been others!). The first two were ‘Rooted Beings’ at the Wellcome Collection in 2022 and ‘Soil’ at Somerset House earlier this year.

Illustrated herbal in Old English, about 1000-1025.
Unearthed exhibition at the British Library, 2025 — Beautiful gardening illustrations from the 11th and 17th centuries

Sketches of gardening tools by John Evelyn, approx. 1660-1680. Unearthed exhibition at the British Library, 2025 — Beautiful gardening illustrations from the 11th and 17th centuries

This exhibition, as the title suggests, was more about the actual act of gardening than the other two, and as such had quite a lot in common with the permanent display at the Garden Museum. The British Library’s advantage was its access to phenomenal (and in some cases phenomenally old) examples of historical books, and its focus on gardening and gardeners, rather than the gardens.

A visit to Great Dixter, July 2025

Fresh off a flight from America, Fergus Garrett addressed approximately 300 people seated on hay bales in the Plant Fair Field, in one of the regular Friends events held at Great Dixter. He had returned that morning from a 20 day stay, lecturing and touring, with some of the stay devoted to Chanticleer. Fergus drew comparisons between the gardening practice there and at Great Dixter. At Chanticleer they artificially oxygenate their compost heaps to accelerate the process, whereas at Dixter these are left to decompose naturally. He also drew attention to how little water is used at Dixter – at most, the Long Border has been watered three times this year – but at Chanticleer watering is a regular feature of garden maintenance.