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Monty Don demonstrates how to plant heritage variety shallots in a container, offering advice on drainage and planting depths.springMore advice on growing alliumsHow to harvest garlicGrowing onions and garlicPlanting out leeksTips on growing garlic

Watch Monty Don's video demonstration of how to sow spinach seeds, with advice on the ideal location, soil preparation and spacing.springMore advice on growing vegVideo advice on sowing salad leavesSow lettuce seeds in gutteringHow to sow seeds

Chris Beardshaw demonstrates how to prune an old viburnum, removing sideshoots and woody growth to reinvigorate the plant and encourage flowering.springMore advice on pruning plantsHow to prune shrub rosesAdvice on pruning techniquesHow to summer

based on sulphate of iron. When the moss has blackened (after two or three weeks), use a spring-tine rake to remove it. Apply it in calm conditions when there is least risk of accidentally damaging nearby garden plants.all over the garden

Plant summer bulbs, such as liatris, begonia, gloxinia, gloriosa, canna, eucomis and agapanthus Maintain frost-free conditions by installing a thermostatically controlled electric fan heaterBring pots of spring bulbs into the greenhouse to encourage

for early sowingsCarry on sowing seeds in pots or trays in the greenhouse, ready to transplant later, including Brussels sprouts, spring cabbage and onions

Pruning roses keeps them in shape and encourages more flower growth and healthier plants. Cut weak shoots right back to promote stronger growth from the base.Rose bushSecateursautumn or spring20 minutesRemove dead shoots and the tips of stems

Winter pruning wisteria encourages the development of short-flowering spurs that carry the flowers in spring. The long vigorous shoots produced on the wisteria need to be cut back at least twice during the year, so you'll need to repeat this pruning

The caterpillars of both the small and large cabbage white butterflies are are the two culprits. The first is pale green with a body up to 2.5cm long, the second is bigger at 4cm and is yellow with black markings. The adult butterflies lay eggs

established and spread.Cut back stems of established plants, and treat the regrowth in spring and summer with brushwood killer. Treat the foliage of seedlings and young plants with a systemic herbicide, which will kill the roots as well as the top growth