Plant new trees and shrubs
The dormant season – autumn and winter – has always been seen as a good time to plant trees and shrubs. But if the pattern of dry springs and summers experienced over recent years continues, the sooner you get plants in, the better. The soil is still warm, there’s plenty of moisture around, so plants put into the ground now will have a chance of establishing an effective root system before winter.

Divide perennials
Perennials that have finished flowering and have formed decent-sized clumps can be divided now. If the centre sections are woody and unproductive they can be cut out and discarded. Re-set the other pieces where you want them, water them in, and they should be able to establish before the winter.

Use Fallen leaves
Autumn leaves should be cleared from lawns and paths (and beds too, if you wish) and can be collected up and turned into leaf mould – either in a purpose made-bin (with wire mesh sides) or in bags (hessian bags are best, but you can use plastic – but punch lots of holes in the sides and bottom with a garden fork). You could leave them on the beds as a soil-improving mulch that will rot down naturally – just make sure any small plants are not swamped.

Lawn Repair
Hopefully most lawns will have turned green again by now, but this is traditionally a good time to do remedial work, and after the summer we’ve had, many of them need it. Aeration reduces compaction, and can be done either with an aerator (manual, or powered), or with a garden fork. Push it in as far as you can, wiggle it about a bit, pull back on it to slightly lift the ground, and then repeat across the whole area. This is, I have to say, a job that consumes a lot of time and energy. Scarifying (raking) is good for the lawn too – it gets rid of a lot of the dead material, as well as moss. Any bare patches can be re-seeded.

Check tree ties
Bear in mind that tree trunks will have expanded, even during the poor growing season we’ve had. So if you have trees that are staked, you may want to check they aren’t being strangled. If ties are too tight, loosen them a little. A galvanised nail banged through the tie and into the stake (not the tree!) will stop the tie from slipping down.

Weeding
A perennial task, but despite the cooler temperatures, weeds are taking advantage of the rain to sprout and grow fast. Hoeing is not so effective in damp conditions, so weeds will need to be pulled or dug out. But…

Look for self-seeded plants
…pay attention, because among the weeds will be self-seeded plants you may want to keep. These might be wild flowers such as forget-me-nots and foxgloves – some people may see them as weeds, but many gardeners are happy to have them, as they’re colourful, attractive, and free. Many cultivated perennials, such as Verbena bonariensis, and Gaura, will self seed. And you might even find some surprises. In my garden, Salvia ‘Royal Bumble’ – a choice shrubby plant – has produced a couple of dozen seedlings in the ground around it.

Clean the greenhouse
Yes, I know – you don’t want to hear this, but it’s a good idea to thoroughly clean your greenhouse (if you’re lucky enough to have one). Cleaning the glass benefits the plants by maximising the light coming in. And keeping a clean greenhouse reduces hiding places for pests to over-winter.

Think about wildlife
Dead foliage and flower stems of perennials don’t necessarily need to be cut down until next spring. Left where they are, they will provide habitat and food for wildlife over the winter.

Store tender plants
Dahlia tubers can be lifted from the ground or removed from pots, cleaned up, and stored in dry material such as compost, sand or wood shavings, in a cool, dry, frost-free place. They don’t need light, so a garage or shed would be fine. It’s usual to wait until the first frosts have blackened the foliage before doing this. You can leave them in the ground, ideally with a thick mulch of compost on top, but there’s a risk they won’t come back next year if we have a cold and wet winter.
Cannas, frost-tender salvias (such as Salvia ‘Amistad’), pelargoniums etc. can be brought into the (freshly cleaned!) greenhouse (or a shed or garage, if you don’t have a greenhouse), in pots, ideally before the first frost. So keep an eye on the weather forecast!

Planting bulbs
It’s still a good time to plant bulbs for next season, in pots and in the ground. It isn’t too late to plant early bulbs like snowdrops, crocuses, or the little reticulata irises; or too early to plant later bulbs like alliums. I placed an order with Crocus again this year. Their plants can be expensive, but their prices for bulbs were very reasonable. I ordered ten each of three varieties of tulip, thirty Allium hollandicum ‘Purple Sensation’, and a pack of Iris reticulata. Very restrained!

One problem I’ve encountered is that it’s impossible to identify where bulbs you planted into the ground in previous years are at this time, so you can end up inadvertently digging these up (and often damaging them), while you attempt to put the new ones in. Monty Don, on Gardeners World, offered a good solution to this problem. He planted his Allium hollandicum bulbs individually into small pots. He will plant them out next year, when bulbs in the ground are showing new growth, so he can avoid damaging them.

Covering pots with mesh, netting, chicken wire etc., until the bulbs start sprouting, will stop rodents digging them up and eating them. Some people do this for bulbs planted into the ground too, but it isn’t always practical.

Sow seed
And on the subject of greenhouses… Seeds of some annuals and perennials can be sown now, and kept in the greenhouse, rather than waiting for spring. Sweet peas are a favourite, but things like Ammi major, when sown in autumn, will flower earlier next year. A few weeks ago I sowed some Scabious (Scabiosa atropurpurea ‘Black Knight’), put them on a windowsill inside to germinate, and then moved them to a greenhouse bench to over-winter.

The summer is over, and it’s getting cold, damp, and dark. But there are still some warmer, brighter days. And the light at this time of year has a special quality. So if you choose your time, you can still enjoy the garden.

text & images © graham wright 2022