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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

All plants need nitrogen, potassium and phosphorous to thrive, plus various trace elements. Without nitrogen the leaves turn yellow and growth is spindly. Potassium generates good flowering and fruiting and helps ripen wood. Plants lacking potassium

and turn a blind eye to other areas of the plot that need attention. My purple sprouting broccoli, for example, is now in full flower. I won't be using that bed until I'm ready to plant sweetcorn, so I may as well leave the blooming broccoli to provide

penstemon, a tiarella and a catmint, Nepeta racemosa 'Walker's Low'. Sadly, the plant label is virtually all I have left of my once stunning purple-flowered plant. It met its doom on the front steps, still in its nursery bag, within an hour of arriving home

'Freda' - a pretty plant with purple-tinted leaves and pink flowers. The arbour is gorgeous to look at, but becomes a more favourite haunt as it provides me with a leafy retreat, laden with the best of summer perfume.Add to this some night-scented stock

ornamental cabbages with marvellous frilly leaves, in shades ranging from washy pink to beetroot to deep purple, together with larger ornamental kale.The Americans are very keen on ornamental cabbages and use them in quantity for public plantings (and also

.It took me a while to find the best spot for them.  Heavy clay isn't really ideal, but I've been blessed with wonderful allium displays that return year after year.Their dense pom-pom flower heads, composed of numerous purple 'stars', provide an easily

, mauves or white are held on strong, medium-tall wiry stems that don't need supporting.Japanese anemoneThis must-have plant has short stems of large bell-shaped flowers in purples, pinks and blues. It's drought tolerant and pretty hardy, although it

Hampton Court Palace Flower Show is always a good place to look for new 'grow your own' ideas.  The Growing Tastes Marquee this year was better than ever: my highlights for 2010 were garlic and blueberries.I could smell The Garlic Farm's beautiful

and dissolve 1.3kg sugar in it• Take off the heat and add the flower heads• Slice 2-3 lemons into a bowl (at this point you can add citric acid to prolong shelf life)• Pour the liquid over the lemons, cover and leave for 24hrs• Strain into a bottle• Add ice