Gardening calendar: plant hanging baskets and feed lawn –

2 Create new plants from last year’s pelargoniums

Take cuttings now and they’ll be ready to be replanted in a couple of months
and be in full flower in four. Cut your plant back by two thirds, aiming to
cut immediately above a lateral bud – or node with a bud potential. From
what you have cut off, select the best-looking stem tips and cut into 10cm
(4in) sections, discarding any that don’t have plenty of shoots or nodes.
With each section, strip almost all the leaves from the stem, leaving only
the apical pair. Insert the cuttings to about a quarter of their depth into
a gritty mix of compost. Put them in a heated propagator if you have one, or
store them somewhere bright but cool. Keep their compost moist at all times.

3 Sow zinnias in a greenhouse

If you have any spare space in a greenhouse
around potential tomato
beds, direct sow a pack of zinnias.

Sown now and kept well watered under cover, zinnia varieties such as ‘Giant
Dahlia Mix
’ will form a 4ft (1.2m) hedge. They’ll give you vases of
flowers to pick right the way through the summer.

Read more: Zinnias: late-summer superstars

4 Plant out spring-sown sweet peas

Peas on earth: it’s time to plant out sweet peas (ALAMY)

Two plants to each upright gives a good covering and plenty of cut flowers,
without the hassle of cordon training. Dig a good, deep hole and fill the
base with farmyard manure. Back fill an inch or two of soil and plant your sweet
. Tie them into the base of the arch
or frame
and water them in well.

Read more: The secrets to sweet pea success

5 Finish planting summer-flowering bulbs

This includes eucomis,
crinums and the deliciously scented cousin of the gladiolus
– acidanthera. Plant them in pots or in the ground.

6 Plant up hanging baskets

Hanging gardens: keep your baskets under cover till the frosts have
passed (ALAMY)

Keep them under cover to grow on until the frosts have passed. Go for
something exceptionally long-flowering such as the Argyranthemum ‘Cherry
Red’ or verbenas
such as ‘Homestead Purple’.

Read more: How to make your own hanging basket

7 Tie-in climbers
such as clematis

They will be growing rapidly now. Use sweet pea wired supports for speed and
ease, gently spreading out and attaching the new growth to the wall’s wires
or frame.

Feed lawns
and treat for moss

Try to work out the reason for the moss. Is the grass too shady, the soil too
acid or too compacted? Aim to sort the problem out now for a lovely lawn all

9 Watch out for weeds

Weeding out: look out for perennial weeds like bindweed (ALAMY)

Perennials such as bindweed, will start to appear big time now. Dig them out,
tracing the roots as far as you can, or train the tip up a bamboo cane and
then treat with a suitable weedkiller.

10 Earth up your potatoes

They should be starting to sprout. This helps protect against late frosts
and buries any superficial tubers near the soil surface and so preventing
them turning green (which makes them poisonous).

Read more: Potato growing tips

Buy plants,
tools and accessories
from the Telegraph Gardenshop.


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