Cool & green: the heatwave solution

Browsing the weather forecast for the rest of the week, it looks like the mercury is going to go sky high and we are in for a real heatwave. I love to find a cool spot amongst lush shady plantings of palms, ferns and foliage plants such as bromeliads. The so called self cleaning palms always leave an interesting pattern of stripes on their trunks as the old fronds are shed. Planting strap leaf or vertical plants nearby makes for a wonderful contrast of form and pattern.

Tansy, Tanacetum vulgare

Icon of St. Athanasius
Pope of Alexandria, Egypt
Born C293, Died 2nd May C373

The herb Tansy is dedicated to St. Anthanasius

Tanacetum vulgare, Tansy

When I took over my plot at the community garden, I had to deal with several square metres of Tansy which had run wild. It took months to get it under control and even now I regularly chop it back and curse it, with apologies to St. Athanasius. It is a herb which is often included in organic gardens as the leaves, which are strongly bitter and aromatic, have some insecticidal uses and are said to be beneficial when added to compost heaps . In mid-summer the plant reaches well over 1.5 metres tall and produces masses of yellow button flowers which are very decorative. As a medicinal or culinary herb it has fallen from grace and is considered too dangerous to use, though many recipes still exist, especially in association with the Easter festival. An Easter pudding (a sort of custard pie) or Easter cake was simply called a tansy and was thought to be a wholesome antidote to all the salt fish that was consumed during Lent. The winner at stoolball, a game played at Easter time and basically the medieval forerunner of cricket or baseball, was presented with a tansy cake and hopefully a tankard or two of ale for their efforts.
Though native to Europe, tansy was one of the first plants brought to North America by the settlers. In the days before refrigeration, it was an important herb to keep food fresh and detrimental insects at bay. It also had uses as an embalming herb, either placed around a corpse or used to line a coffin. By the mid 18th century, tansy was growing wild along the hedgerows of Pennsylvania and it quickly became part of the American country scene. Tansy bitters, made by steeping leaves in a bottle of New England rum was a popular spring tonic and in the old mining area of South Dakota a similar brew was made using whiskey. Tansy is a survivor in abandoned gardens around farm houses, oblivious to competition from grass and other weeds. Plant it in your garden for its interesting historical significance but with care, that it does not overtake more desirable plants. There are some interesting cultivars which are worth looking out for as they are likely to be less invasive, including the variegated 'Silver Lace' and 'Isla Gold" and the fern leafed variety 'Crispum'.

China Aster, Callistephus chinensis

Pink and blue Asters, Callistephus chinensis

Asters are tricky to grow well and I only had mixed success in growing them this summer. If you are not prepared to spray, they can be attacked by aphids, caterpillars, nematodes, powdery mildew, rust, wilt and root rot. They are worth the effort however as they make a terrific cut flower with their tall stems, especially the 'ostrich feathered' types such as 'Giant Crego'. I grew it and 'Perfection', both of which were available in punnets at my local garden centre, as well as some from seed . The first lot of seed failed to germinate and then the second batch did quite well by which time I had already planted out the punnets.
Peter Valder gives an interesting history of this Aster in his book The Garden Plants of China where it has been cultivated for centuries and known by the name of Cuiju or Kingfisher Chrysanthemum or Lanju blue chrysanthemum. Seed was sent to Europe in 1728 where pink and white forms were subsequently developed. Dorothy Graham writing in her book from 1938 Chinese Gardens describes eloquently 'the misty purple blue of China asters' and their 'feathery blossoms' which she used for filling in the spaces in her garden where other plants had thinned.
I am not a huge fan of the dwarf varieties such as the one pictured below, 'Starlight Rose', as these often get sold as instant potted colour, so the taller varieties become less well known and grown.

The Oleander Handbook

The Handbook on Oleanders by Richard and Mary Helen Eggenberger is a book of great charm and is the definitive guide to the cultivation of Oleanders and other members of the Apocynaceae Family. It is also a book about a community of keen gardeners who did much to beautify and transform the US City of Galveston with their enthusiasm for this one plant. Up until now, any mention of Galveston got me humming the Jimmy Webb country song about the Spanish American War of 1898 ('I still hear your sea waves crashing /as I watch the cannons flashing / I clean my gun/ And dream of Galveston')
I caught the bug for growing Oleanders during the long years of drought and when I came across a variety I had never seen before I was hooked. I saw the one pictured below in a friend's garden and just had to propagate from it. It is a hose-in-hose pale pink flower with a pearly sheen to the petals ,very delicate and exquisite looking. The parent plant was not particularly robust at a little over 2 metres tall and with smaller leaves than normal. Like many plants you see potential in, this is one I will have to grow on for a few years and perhaps develop as a standard tree shape to show off the delicate flowers to best advantage.
2017 update: I have stock of a range of different Oleanders. Love 'em

 Pale pink hose-in-hose Oleander

Goat's-thyme, Satureja thymbra

Satureja thymbra: Goat's thyme / Savory / Thrumba

Still in Greece or Crete to be more precise, this is a terrific barbecue herb as it combines the flavour of thyme, rosemary and oregano, and can be added to marinades or small branches can be placed directly on meat or vegetables such as eggplant while cooking. It is quite a strong aromatic herb and in its native habitat grows on dry rocky hillsides which come alive in spring to the sound of bees which are attracted to the bright pink flowers. I grow mine in a pot where it can be kept on the dry side. I always lose plants I pamper by putting them into compost rich garden soil. Recently I collected the seed which had formed in the old flower heads and hope to grow some more plants of it in this way.
2017 update: I still grow this and occasionally have plants available for sale.

Plant pathology:Bean rust, Uromyces appendiculatus

Bean rust, Uromyces appendiculatus

In late January and for most of February, the vegetable garden goes into a bit of a decline as fluctuations of temperature, showery weather and high humidity, especially on the coast, make for an increase in fungal diseases, in particular rusts and mildew. The bean rust pictured above is clearly visible on the dark leaves of this purple climbing bean showing up as yellow spots on the upper surface and rusty orange blisters on the lower surface of the leaf. After a week or so the leaves start to turn papery brown (see below) and die, resulting in decreased yields and premature death of the plant. Spraying with a sulfur based product or eco-carb in the early stages may halt the spread to other plants but badly affected plants should be removed and binned not put into compost.

2 fantastic Cannas

Canna x 'Constitution'

Canna x 'Intrigue'

These are my top 2 Cannas from this summer. Canna 'Constitution' has been in flower for about six weeks. The pale pink flowers are complimented by smokey bronze foliage. It is an American cultivar bred by geneticist Robert Armstrong.
C. 'Intrigue' is less noted for its flowers, which are small and insignificant, but it has a striking architectural upright habit and strongly pointed long leaves. It is thought to have originated from a Botanic Garden in Eastern Europe where it had a different cultivar name. It was introduced to the wider garden world by Herb Kelly Jnr of Kelly's Plant World of Sanger, California.
2017 update: I no longer have either of these Cannas unfortunately.