Plant of the Month

Gardening Summer Glory, August 2010

Tuesday, August 17th, 2010

So far so good as far as this summer is concerned! We have been really lucky in this part of the world; it was a very cold winter with plants going into quite deep dormancy, enough rain to top up the underground supplies and soil moisture levels but not too wet for most plants. We had a late but incredibly colourful spring with wonderful blossom on most trees and shrubs.

Since then, warm dry days with the occasional bit of rain, have allowed everything to grow but kept at bay some of plant disease problems that you associated with cold wet growing seasons. Roses look good and not too much potato or tomato blight as yet. The importance of soil health is really obvious in dry periods. Soils with lots of organic matter in them and even better, soils with a good layer of mulch, hold their moisture longer and produce better crops. The investment in compost or bark is easily paid off by the improvement in the plants that are grown, and that’s all there is to it. If you don’t want to buy ready made compost and lug heavy bags from garden centre to garden , and if you don’t have a friendly farmer neighbour, then you should be making your own compost. Invest in 2 good sized compost bins, plastic, wood, metal; whatever you prefer, and collect all you uncooked vegetable kitchen waste, hedge trimmings and grass clippings. Make sure they get mixed up to avoid slimy heap, keep it moist enough to heat up and let nature do its thing.

Plant of the Month

I can’t remember a summer without hydrangeas. Their large blooms bring flamboyant colour to the garden in late summer and autumn. They are easy to grow, dependable and improve with age. Use them in big, bold groups in the border, or even try them in large containers.

Hydrangea arborescens Annabelle

Hydrangea arborescens Annabelle

Hydrangeas are deciduous and can be either treated as large shrubs or small trees. They are grown for their beautifully domed or flattened flowers which appear from late summer for about a month.

The flowers normally consist of a mass of fertile flowers surrounded by infertile flowers which give the hydrangea its large flower heads. Hydrangeas are recommended for the amateur and the experienced gardener alike.
Mop head hydrangeas (with rounded heads of large flowers) come from Japan where the native species with lace cap flowers (flattened heads of large flowers) have been grown for hundreds of years. When these plants reached the west in the eighteenth century they caused a sensation, initially treated as tender and grown indoors. There are now many, many varieties to choose from.

Soils for Colour

With Hydrangeas, the soil type determines the colour. Acid soils for example produce blue flowers. To create blue flowers on a chalky soil, use a blueing compound composed of aluminium sulphate. This can be purchased at your local garden centre. However, the results won’t compare with plants growing in a naturally acid soil.
Alternatively, you could grow a compact variety such as ‘Blue Bird’ in a large container filled with ericaceous compost and supplement its liquid feed with a blueing compound.

Site and Watering

Hydrangeas are true survivors and can be often seen flowering in overgrown and neglected gardens. Mop heads and Lace Caps prefer dappled shade against a north or west facing wall. If it is too bright they are likely to scorch. Their leafy shoots need plenty of moisture during the summer, apply a mulch of well-rotted compost to drier soils to help lock in moisture and promote decent sized flowers. Plants also need to be sheltered from cold winds which can scorch new foliage during the spring.

Pruning

Pruning isn’t essential but can be done each spring as new shoots appear. With established plants, just remove one third of the older, less productive stems and cut back old flowering stems to a strong pair of buds.
Leave old flower heads on over winter to provide frost protection for new growth. The brown papery domes look great when covered with hoar frost.
Left unpruned Hydrangeas will continue to bloom but the size of the flower heads will be reduced by the overcrowded stems. Hydrangea paniculata types need to be cut back completely each spring.
Hydrangea paniculata ‘Unique’
Hydrangea paniculata ‘Grandiflora’
H. arborescens ‘Anabelle’
H.villosa
H. quercifolia (oak leaved hygrangea)
H. seemannii one form of climbing hydrangea
H. ‘Blue Bird’
H. ‘Grayswood’
H. macrophylla ‘Altona’ (Pink)
H. macro. ‘Blue Wave’ (Blue)
H. anomala ‘Petiolaris’ (another climbing type)
Hy. ‘Forever Summer’ – - a new group of hydrangea varieties that flower on their current season’s  growth.

Jobs for the Month –

In the fruit garden – early and mid-season strawberry plants need to be cut back tidied up and mulched to get the plants to recover after their exertion. Summer fruiting raspberry canes should be removed so that the new canes can grow well enough to be trained for next year’s crop.
Summer pruning is every bit as important as winter pruning
and is absolutely essential for fan trained peaches, nectarines and cherries, as well as for espalier and cordon apples and pears. Trim back the long side shoots so that they are only 1 leaf over the basal cluster or leaves – sounds tricky but is very obvious once you look at how the trees grow. If you are short of time you can always get the hedge trimmer out to take back the superfluous growth that is draining the plants and deflecting goodness from the fruit crop. Then trim back properly later in the year. While you have the secateurs handy and if you have a wisteria then apply the same rules to that and follow up with a further pruning in January.
Vegetable gardens – regular picking helps production – if you don’t pick then the plant will assume that no more is needed which will leave you a few leaves short in the veg trug!
Onions, shallots and garlic should be lifted and left in the sun to dry for better storage. Wet bulbs will rot.
Check potatoes and tomatoes for blight – any brown spotted and blotched leaves should be removed and burnt. Finish lifting early and second early potatoes before either the blight or the slugs make them unusable. Caterpillars will strip Brassicas a plant in not time. Check to see if they’re there. Either pick them off, or spray with pyrethrum [plant derived insecticide] or a manufactured product such as Provado Ultimate Bug Killer]. Crops are really best covered with a fine mesh such as Haxnick’s Enviromesh.
There is still time to sow salad and leaf crops for harvest this year. Radish, spinach, lettuce, parsley and rocket as well as herbs such as coriander and chervil.
Ornamental pots and planters need regular feeding and watering.  It is asking a lot of any plant to have 6 months flowering – so give them regular attention. Grass shouldn’t be cut too short in dry weather nor left too long in wet weather or you’ll never get through it. Still no news I’m afraid of the long awaited neat & evenly footed, low-methane grass eating animal that will do this job for us. Has to come one day I’m certain of that, and it could also help with shredding material for the compost heap.
Finally rose growers, a good feed and mulch now will help most sorts, except the species roses to recover strength for their autumn display.

Plant of the Month – July

Monday, June 21st, 2010

Which plant group is the backbone of the summer garden, delivering colour, fragrance and attracting the attention of beneficial wildlife and humans alike? The answer is perennials, that wonderful family of herbaceous plants that launch into life every spring.

Think of the stars of borders in gardens big and small and the chances are they will be perennials. Colour is key with perennials – there is such a varied palette to choose from. It’s up to you to decide the mood you want as the garden backdrop to your life – the excitement or vibrancy of red, the romance of pink or the calm of blue and for a plant family that offers all of these and more, look no further than perennial Salvia or sage plants.

Offering true perennial perfection, these are a wonderful choice for gardeners looking to bring stunning colour and style to their borders. There is an amazing range to select from, many of them Award of Garden Merit holders, so you can be sure of getting top performance. Now is a great time to plant container grown plants and many salvias are drought tolerant, once established. This makes them a fantastic asset if you are gardening in a drier area.

Some Salvias are great for attracting beneficial wildlife, including butterflies and bees. This will give a boost to the overall health of both your garden and the surrounding environment – so what are you waiting for? Like most perennials, Salvias are easy to look after. Some are fully hardy across the UK, but others are less so and in certain areas may be better looked on as annuals. The name Salvia comes from the latin ‘to heal’. We still use culinary Salvia in stuffing, perhaps unconciously helping our digestion!
Here are some suggestions: Salvia nemorosa ‘Caradonna’ – a wonderful perennial reaching about 75cm in height, bearing violet to purple flowers, fully hardy. Chelsea 2010 Best in Show Award winning designer Andy Sturgeon highlighted this variety in his BBC TV interview prior to the show. Salvia officinalis – a foliage plant with culinary uses, evergreen and hardy, up to 80cm high; Salvia coccinea ‘Lady in Red’ – great for a summer show of red flowers (tender). The closely related ‘Lady in White’ bears white flowers. Salvia patens ‘Cambridge Blue’ is frost hardy (safe down to -5oC’) and produces very elegant, pale blue flowers. Salvia pratensis is a clump-forming perennial with a woody base. Up to 90cm in height and bearing flowers of violet, though in some case may be pink or white. Hardy.

Salvias are a sun-loving plant, so grow in either full sun or dappled shade. Soils need to be well-drained and moderately fertile. Remove flowers once they have ‘gone over’ (dead heading) and trim in late spring any shoots that spoil symmetry.

How to grow your Mangold Wurzel

Monday, April 12th, 2010

Mangel Wurzel or Mangold Wurzel (Beta vulgaris), is a root vegetable of the family Chenopodiaceae, genus Beta (the beets). It has large white, yellow or orange-yellow swollen roots – mostly above ground. Both leaves and routes can be eaten, if you find you’re really hungry! Leaves can be slightly steamed for salads or lightly boiled as a vegetable if treated like English spinach. They like to be well fed and watered and the roots like potato for serving mashed diced or in sweet curries.

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Plant of the Month, September

Thursday, August 27th, 2009

Imagine the archetypal Japanese garden, characterised by simplicity, refinement and calm. The garden is an idealised representation of nature arranged to create a sense of well-being and to serve as a refuge from the stresses of the world. An Acer throws gentle shade onto the house, helping to keep it comfortable through the heat of the day and provides delightful colour effects through spring summer and autumn. A decorative bridge crosses running water and bamboo screens provide sympathetic divisions between the different sections of the garden. Don’t you just wish you were there? With the right plants you could achieve a similar feel in many British gardens.

Perhaps your most important ally in achieving this is the Japanese maple or Acer palmatum. A deciduous tree with a history of cultivation well in excess of 300 years, Japanese maples have been grown in temperate areas outside Japan since the 1800’s. They are well suited to garden conditions because of their compact root systems which are unlikely to undermine paths, structures or compete with other plants. Many Acers have characteristics that are striking through the different seasons, including intense autumn colour, brightly coloured winter bark and fresh new growth in spring. Their style and compactness makes them ideally suited to courtyard gardens, so much so that Acer palmatum ‘Red Pygmy’ ranks second on Channel 4’s ‘10 plants for courtyard gardens’.
Garden centres offer an exciting selection, with many having dedicated shade houses to show off Acers to their best advantage and protect them from too-strong sun which may scorch leaves. Some Acers will grow into small-medium sized trees at maturity. ‘Osakazuki’ (brilliant red autumn colours), for example, may reach a height and spread of 6m. ‘Bloodgood’ (height and spread up to 5m) is always popular and the dark red-purple leaves take on a fantastic vivid red in autumn. For very finely cut leaves as well as colour, look to ‘Garnet’, ‘Burgundy Lace’ or ‘Dissectum’ (leaves turn gold in autumn). These are also on the bigger side for Acers. For very confined spaces or containers, look out for ‘Red Pygmy’, ‘Corallinum’ or ‘Crimson Queen’.
Acers are adaptable plants, but are unhappy in wet or dry conditions and find very alkaline soils difficult to cope with. Some shade is an advantage for green-leaved or variegated varieties, but red leaves do need sun to develop deep reds to their full.

As we move into September, the next event in the natural calendar is the turning of the leaves, prior to their fall. This selection of Acers, plus many others that can be found at retail outlets, can provide a wonderful reflection of autumn right by your doorstep. Couple this will some Far Eastern flavour and you can create some garden magic to come home to!

Plant of the Month – August

Friday, August 14th, 2009

Mid to late summer can still produce stunning plants. I know a lot of your summer favourites are finished or having a rest before the autumn flush, but there are lots of good hardy perennials to choose from.

If you’re looking for a plant with architectural qualities, a hint of the exotic and very low requirements for care, then ornamental grasses could be your answer. Flowering grasses provide a spectacle in the garden that far outweighs their demands for care, or their initial investment. Many, including Imperata, Pennisetum and Miscanthus are said to be ‘trouble free’ and they can bring pleasure year after year. They’re also fantastic for softening up hard landscaping, perhaps on a new-build site.

The range of ornamental grasses available these days means that you can find something for every situation. In even the smallest garden you should be able to plant specimens of several different species/varieties. The taller species and varieties offer the promise of sensory reward from the movement and sound as breezes sough through the leaves. Shorter grasses are suitable for container planting.

Here is a flavour of the wide variety of shapes and sizes on offer. Miscanthus sinensis ‘Silberfeder’ (silver feather) can develop stems as long as 2.5m that remain as an attractive garden feature through winter. The leaves of Miscanthus sinensis ‘Zebrinus’ are shorter (reaching about 1.2m), but the creamy horizontal banding they exhibit can make them appear stippled in sunshine on cloudy days. Imperata cylindrica ‘Rubra’, also known as the ‘Red Baron’, is another spectacular grass. It’s a clump-forming plant and the leaves are shorter, at about 40cm, but they turn red from the tips of the stems downwards, almost as far as the base. Penisetum villosum (also known as feathertop) is an example of a wonderful perennial grass that produces soft, feathery heads in late summer and early autumn.
Ornamental grasses combine well with other plants. Autumn flowering plants, for example, asters, helianthus or chrysanthemums make good partners, but foliage plants can also be effective alongside more subtle grasses. For example a side-by-side blend of the foliage of Miscanthus sinensis ‘Variegatus’ and Elaeagnus ‘Quicksilver’ can be a delightful and understated combination.

Most grasses are easy to grow and will thrive in even poorer soils, though they do tend to need a full sun position. Once established they will perform year after year with the minimum of intervention and have low water requirements, making them perfect for drought-prone areas. However, if you want to do your best by them, feed in spring with a general purpose fertilizer. They’re sufficiently sturdy to survive the odd ball being kicked through them, which makes them the ideal choice for a family garden.
Grasses bring a soft and sympathetic element to the garden and don’t need a lot of water or care. The flowers add colour and contrasting shape and texture. These can all allowed to grow in amongst each other, and the effect gets better each year. Cut them all back at the end of the winter to let the new growth come through, then enjoy the fresh foliage, developing flowers and then the wonderful summer colour. When all is done the grass and flower seed heads provide food for the birds as well a great winter display.

Stipa brachytigra

Stipa brachytigra

Imperata cylindrica Red Baron

Imperata cylindrica Red Baron

Plant of the Month