How to plant a winter window box

December 1st, 2019 Posted In: Container gardening

I asked garden designer and GBBO finalist Jane Beedle (@janebbakes on Instagram) for her tips on planting a winter window box.

First we went along to a local plant nursery, Meadow Grange near Canterbury, to shop for the plants.

The magic trio: height, colour, trailing

‘I’m looking for plants with some height and structure, said Jane. ‘Then I’ll add a trailing plant, and some colour.’

Shopping for plants at Meadow Grange

We went to Meadow Grange nursery in Blean, near Canterbury to choose from a wide range of shrubs and seasonal plants.

We started with the colour. Red, pink or white cyclamen are a good choice for Christmas. Jane spent a bit of time picking out fifteen red cyclamen plants which were close in shade to each other.

‘You need to pack a winter window box much more tightly than a summer one,’ said Jane. ‘In summer, the plants grow to fill the box quite quickly but they won’t grow in winter, so if anything you have to over-stuff it.’

The ‘three colour’ rule

There’s a well known rule when choosing colours in window boxes. You should stick to three colours, and not to forget that green foliage is a colour. A window box is a limited space and it’s easy for it to look messy.

‘Although I think you can get away with combining a range of soft pinks, blues and purples in the summer,’ added Jane. So she decided on  red, rather pink or white cyclamen, not all three.

Jane added a variegated ivy as the trailing element. There are more choices of trailing greenery in summer, but in winter, it’s probably going to be ivy. She picked out some ivy pots that were already trailing – ‘they’re not going to grow much at this time of year, so pick out the ivy lengths you want.’

However, you can split ivy plants so one or two plants can provide trailing stems all the way along the window box.

A window box needs structure

Next comes structure and we came up with three choices: some miniature golden cypresses, some very small eucalyptus and also some upright rosemary.

‘Try out the combinations at the nursery’, advises Jane.

We lined up the rosemary, with a small stripey grass and the cyclamen. Nice, but it wasn’t exactly what she wanted.  Although Jane liked the idea of using herbs because it meant that they would be used – it seems more sustainable.

Try different plants for height and structure

We tried out rosemary (now known officially as Salvia rosemarinus!) for the height and structure.

Next we lined up the golden cypress and red cyclamen with the ivy. This was vibrant. Perhaps too vibrant?

Miniature cypress trees for a window box

Golden cyprus plants for a zingy contrast in the winter window box?

So we substituted some small eucalyptus plants instead of the cypress. Their grey-green looked beautiful with the cyclamen.

Eucalyptus, cyclamen, ivy and barbed wire plant for a winter window box.

Final choice – a really pretty combination of eucalyptus, ivy, cyclamen, barbed wire plant and Leucothoe ‘Scarletta’, a shrub with red-tinted leaves.

Jane completed the plant choices by adding another silver-leafed plant, known as the Barbed Wire Plant to add texture and light.

Planting a winter window box

Back home, Jane tipped half the compost out of her window boxes. ‘Because plants aren’t growing in the winter, you don’t need to replace all the compost,’ she said. ‘Unless, of course, you’ve got vine weevil, in which case you have to replace it all.’

Tips on planting a winter window box

Overplant a winter window box because the plants don’t grow in winter.

Before topping up with the new compost, she dotted some narcissi bulbs in. They’ll grow up in the spring – ‘just be careful to choose dwarf varieties,’ advised Jane. ‘You don’t want anything too tall.’

Then she topped up with soil and stuffed the window boxes as full of plants as she could manage. Although she’d bought masses of plants, there still weren’t quite enough when they’re packed tight. She’d been hoping to fill two pots in the front garden, too, but that will have to be for another day.

Don’t water it until…

‘Don’t water window boxes until you’ve got them up on the window ledge,’ advised Jane. ‘Or they’ll be too heavy to lift.’

Water a winter window box when it's in situ

The final window boxes up on the sill. Water them once you’ve got them in place.

She hoisted them into place, tidied up a few stray scraps of soil, and watered them.

Make a winter window box last till May

‘The cyclamen probably won’t last much beyond early January,’ she said. ‘So I’ll take them out and add primulas or another early flowering spring flower. But the rest of the plants can stay there until I do my summer window boxes in May.’

More about winter window boxes

For good reference books on plants, see The Middlesized Garden Amazon store. (Note: links to Amazon are affiliate, so I may get small fee if you buy, but it doesn’t affect the price you pay.)

I’m often asked for recommendations for gardening books, products and tools so I’ve put together some useful lists, such as this Window Boxes & More list. I’ve picked out some window boxes from companies I’ve used, plus peat-free compost for planting window boxes. And my pick of the books with more window box ideas, such as Alan Titchmarsh’s How To Garden – Container Planting.

More about Jane Beedle

You can find out how Jane transformed a muddy backyard into a beautiful contemporary garden (without busting the budget!) here. 

Jane's Kitchen at Monkshill Farm

Jane Beedle will be starting a cookery school – Jane’s Kitchen at Monkshill Farm – near Canterbury in 2020. Even if you don’t live in the area, there’ll be workshops which will make a great day out.

And since being a Great British Bakeoff finalist in 2016, Jane has been doing cookery demonstrations. She’ll be starting a cookery school near Canterbury soon, so if you’d like to hear about her workshops and cookery days, then send her an email to janebeedle@icloud.com

Pin to remember winter window box tips:

WINTER WINDOW BOX TIPS

 


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