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. In wet weather the fungus spreads quickly. The spores are persistent and overwinter in the soil and on old leaves, stems and rhizomes.Ugly brown speckles appear, merging to affect entire leaf in extreme cases.Healthy plants are less likely to succumb

Groundsel is able to produce lots of seed, and several generations of this weed can grow in a single growing season. Plants can overwinter and act as a host for rust fungus. This weed is adaptable to a wide range of growing conditions. Seed can blow

and thoroughly clean insideCut back overwintered fuchsiasSow summer bedding plantsGreenhouseCreate a decorative path for your garden

die down to tough yellow roots in autumn, over-wintering to grow up again the following spring.Tall-growing perennial plant which spreads below ground by rhizomes or across the surface by creeping stems or stolons to form dense clumps of stinging

Summer is the ideal time to take verbena cuttings. Overwinter the semi-hardy perennials in a frost-free place and you'll have a fresh, healthy supply of verbena plants next year to replace any in the garden that have been killed by frost

The fungus Rhytisma acerinum overwinters on fallen acer leaves, then infects the new spring foliage. The first signs are yellow leaf spots that turn into large shiny black blotches up to 1.5cm across. Severe cases can mean the leaves drop early

eventually turn brown and wither. If the problem isn't tackled, tomato yields are lower and the fungus can overwinter in the greenhouse and persist the following year. Tomato leaves develop yellow blotches, then turn brown and wither. The crop might also

In mid-spring, 2mm-long, greenish-brown, adult bay suckers emerge from overwintering. They feed on young bay leaves, turning them yellow and making the edges thicken and curl. The females then lay eggs under the curling edges and the new, young grey

stems of sedumsClear borders and rake up leaves FlowersKeep harvesting root vegetables as they matureOrder seed potatoes, onion sets and shallotsStretch netting over brassicasFruit & vegSow onion seed under cover, and keep warmCheck overwintering plants

The rich copper colours of the verbascum, fennel, sedum and diascia plants in this pot echo the colour of the warm terracotta pot beneath. Tall copper flower spikes of the verbascum give height to the display while the wispy, feathery foliage