This, the loveliest hour of the gardening year,
is also the time to keep a weather eye open for
insect pests, diseases
and weeds. Feeding plants with fertilisers
or liquid feeds is also important at this season.
Sow perennials in nursery beds for next year’s
TREES AND SHRUBS
Cut out any branches of variegated cultivars that
are losing their variegation.
Take softwood cuttings of hardy fuchsias
and place them in a propagating frame to root.
Shade during sunny periods.
Plant out tender fuchsias when they have been
well hardened off.
Thin out the weak flowering shoots from deciduous
shrubs which have finished flowering, such as
deutzia, spiraea and
Take leaf-bud cuttings of all clematis.
Water wall-trained shrubs during dry spells, and
mulch immediately afterwards to help retain the
Remove any suckers.
Continue to guard against aphids.
Cut back early flowering perennials such as aquilegia
– that need to be kept in trim and discouraged
from self- seeding – to about 4 in, once
the flowers have died.
Lift and divide primroses and polyanthus
after flowering and replant in a shady corner
for the summer, in moisture-retentive soil containing
plenty of humus.
Lift and divide bearded iris
Finish sowing seeds of hardy perennials outdoors
or in a cold frame for flowering next year.
Keep rock gardens and patios free of weeds.
Remove spent flower heads unless required for
the seeds, and clip back any plants that are becoming
WATER AND BOG PLANTS
If aphids attack water lilies, spray leaves with
a powerful water jet.
Keep water clear of algae before large masses
BULBS, CORMS AND TUBERS
In mild districts, plant Anemone coronaria cultivars
for autumn and winter flowering.
Plant out young dahlia
plants raised from cuttings or seeds.
Continue to remove spring bulb foliage not less
than six weeks after flowering has finished.
Gather seed capsules of crocuses
when they start to ripen, and sow.
ANNUALS AND BIENNIALS
Plant out pelargoniums
for summer bedding.
Sow biennial seeds in a nursery bed for flowering
Deadhead annuals regularly to promote a longer
Hoe frequently to keep weeds in check.
Pick sweet peas
each week to promote continued flowering. Do not
let them form pods.
Mow regularly. Raise the blades slightly during
dry, hot spells.
Watch out for greenfly and other aphids. Spray
at first sign of attack.
If not already done, mulch beds after rain.