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Acid-loving azaleas grow happily in pots of ericaceous compost, so you can enjoy these plants even without acid garden soil. They come in a wide range of colours, from deep red and pink to orange, yellow or pure white. Some even have a wonderful

Magnesium is needed to give leaves their green colour, so when there's a deficiency, yellow breaks through between the veins and around the leaf edges instead. Other colours, such as purple, brown or red, might also appear. Older leaves suffer first

colour, from frilly-knicker-pink and daffodil yellow, to navy blue ruffs and watery marmalade. Some seek to combine all the colours of an ice-cream shop in one flower - which I think is a bit of an insult to a noble stalwart. Personally, I prefer

, you can't go wrong with Hakonechloa macra 'Alboaurea'. Forming extravagant mounds of variegated, bright yellow leaves (more lime green in part shade), it brightens any garden.Hakonechloa macra 'Alboaurea'Launched at the Chelsea Flower Show 2008, Jarava

it fared. The results were interesting. The pot-grown varieties (on an east-facing wall) flowered much earlier but, even though we fed them, ran out of steam quite quickly. They still flowered but the foliage now looks yellow and exhausted. The one

of nectar and pollen for bees, butterflies and hoverflies.ValerianIf left to flower, fennel produces attractive yellow blooms that attract hoverflies. Seeds are eaten by birds in autumn and winter.FennelThe wild strawberry, Fragaria vesca, produces white

Why is it that dandelions are regarded as weeds? They're amazingly beautiful, have a strong and reliable flower colour, they're hardy, vigorous plants and they're even edible.I love dandelions, which is great as the warm, wet weather of the past two

, but several of them have black centres instead of the usual bright yellow. This is known as 'strawberry black-eye'.There's no point in keeping strawberry blooms once they've been hit by frost. It's better to pinch out the affected flowers so the plant can

Protected from predators and the risk of dehydration inside its moist ball of bubbles, the juvenile yellow-green froghopper (or spittle bug) is busy sucking plant sap. It's quite harmless unless it's attacking the shoot tips, which can result

on foliage.Yellow to white mottling of upper surface of leaves. Whole leaf may become puckered and turn brown at the edges.Cover a piece of stiff card with grease or contact adhesive and hold it above the infected plants while lightly brushing the foliage