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Oxalis, begonia and lobelia window box

A table displaying which months are best to sow, plant and harvest.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
At its best
At its best

Plant is not at its best in January

Plant is not at its best in February

Plant is not at its best in March

Plant is not at its best in April

Plant is not at its best in May

Plant is at its best in June

Plant is at its best in July

Plant is at its best in August

Plant is at its best in September

Plant is at its best in October

Plant is not at its best in November

Plant is not at its best in December

To do
To do

Do not To do in January

Do not To do in February

Do not To do in March

Do not To do in April

Do To do in May

Do To do in June

Do not To do in July

Do not To do in August

Do not To do in September

Do not To do in October

Do not To do in November

Do not To do in December

Versatile needn’t mean humdrum, as this window box collection proves. Begonia sutherlandii is classier than its hanging-basket cousins, with its tangerine flowers and matching veining to the leaves, while the contrasting leaves of the purple shamrock close like resting butterflies at dusk and open up in sunshine, throwing out lilac flowers on delicate wiry stems.

Place the container on a window ledge in part shade or use to grace a cool flight of steps. Remove the yellow lysimachia flowers when they appear – if you dislike the colour clash – and water well when it’s warm.

You will need

  • 2 x Oxalis triangularis
  • 3 x Begonia sutherlandii
  • 3 x Lysimachia ‘Midnight Sun’ 
  • 3 x Purple lobelia 
  • Crocks
  • Multi-purpose compost
  • Large window box
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Total time:

Step 1

Drill drainage holes in the container, if necessary, and add a layer of crocks to cover them.

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Step 2

Fill the container two-thirds with compost.

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Step 3

Arrange the plants in the container, leaving plenty of space for growth. Firm them in well and add more compost to fill any gaps.

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Step 4

Water the container thoroughly and allow to drain, before moving to its final position.

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Kevin Smith says…

Mix slow-release fertiliser granules into the compost when planting – this will gradually release nutrients throughout the growing season meaning the display will always look lush and healthy.

Kevin Smith