Garden Lore

What is a weed? A plant whose virtues have not yet been discovered.

Ralph Waldo Emerson Fortune of the Republic (1878)

Chamaecyparis lawsoniana ‘Alumii’

Natural layering

This tree reminds me of that old song (and this will date me) “Look there Daddy, do you see, there’s a horse in striped pyjamas” except that it is a tree wearing stiff petticoats and a frilly skirt. No that’s not what it is at all, that’s a fine example of what people call layering. The tree is Chamaecyparis lawsoniana ‘Alumii’. Over time the weight of the lower branches must have dragged them to the ground where, left undisturbed, they have sprouted roots. While the original part of the tree looks a little thinner and paler with ageing, the skirt shows juvenile vigour. It is not common to see a tree layer so evenly all round.

The layers could have been cut off from the parent plant at an earlier stage, dug up and replanted elsewhere. Left to their own devices over time, the strongest growths will flourish at the expense of the weaker ones but there will be a thicket of Lawson Cypress.

First published in the Waikato Times and reprinted here with their permission

Grasses, anyone?

These are New Zealand grasses, seen at their best in a North Devon garden, Wildside

Grasses. There is nothing new about using grasses in the ornamental garden. So why are they being hailed as one of the hallmarks of the New Perennials Movement? It is how they are used, not what is used and that derives from the whole prairie and meadow inspirations which underpin the new styles of freer planting.

It is not without its pitfalls, NABS even. That is the Not Another Bloody Stipa.

Stipa gigantea looks ethereal seen here with phlomis but it looks equally ethereal in everybody else’s garden

Stipas are beautiful, feathery grasses. It is just that they seem to be in every single UK garden, particularly Stipa gigantea, also known as giant feather grass (it is large with ethereal golden spires of seed heads) and Stipa tenuissima which is soft with shimmering ripples in the lightest of breezes. The latter is often called Mexican feather grass and has now been reclassified as a nassella, not a stipa. It is a bit of a shame that it is already on the Weedbusters website in this country as a pest.

The shimmering Stipa tenuissima, seen here with alliums, but not a good choice for New Zealand where it has already been determined an invasive variety

The good news is that grasses are easily substituted and there are many excellent options which are not dangerously invasive. Some are even native to this country. We saw one garden making extensive use of a New Zealand chionocloa. The English have a love affair with Argentine pampas grass. Both Cortaderia selloana and jubata are on our banned list but we have a ready substitute in our native toe toe.

We are guilty of being a bit sniffy about grasses generally in the past. We put this down to the over-use of our native varieties in particularly stodgy and unimaginative amenity plantings from the 1980s onwards. What we learned is that it is how they are used that makes all the difference. Let them get some size and they add the dimension of movement to a garden in all but dead calm conditions. They also provide a superb foil to other plants, particularly larger flowering bulbs, annuals or perennials.

Rivers of a grass at Scampston – a little too conceptual for our gardening taste

Alas we did not think to start counting until quite late in our trip but I can tell you that the ratio of flowering perennials to grasses in the Oudolf river borders at Wisley was 3 to 1. However the Oudolf rivers of grass at Scampston were 0 to 1. That is to say there was only the one grass used and no perennials at all. We didn’t like it. It was contrived – part way between temporary show garden and motorway siding. A conceptual garden, perhaps? In contrast, the elegant grass garden at Bury Court was closer to a 1 to 8 ratio. The complexity of multiple different grasses and a scattering of flowering perennials gave much more visual interest and variation with movement.

Mostly we saw bold grasses of some size, integrated with other perennials in sunny conditions. Problems come when similar grasses are used in all herbaceous plantings. It can make them look very similar, as we realised after looking at a number of gardens. There is a school of thought that this is good because it unifies a garden but we have never subscribed to that belief. We will be choosing to keep the use of mixed grasses and perennials to one garden only, not repeated throughout. I also think the 3 to 1 ratio is quite low. We are more likely to go for maybe 5 flowering plants to each clump of a decorative grass. But then we prefer more detailed plantings.

Nowhere, dear reader, did we see tidy little grasses being used as tidy little edgings. I will be happy to see New Zealanders move on from the thinking that a row of tidy mondo grass, blue festuca or liriope will define a border nicely. I am afraid it will just make your garden look suburban and straitjacketed.

Mark, standing in the elegant grass garden at Bury Court

First published in the Waikato Times and reprinted here with their permission.

Plant Collector: Hellebore Anna’s Red

We are very impressed by Hellebore ‘Anna’s Red’

It takes a special plant in a garden centre to make us think immediately that we must have it there and then. This new hellebore is one.

There are three stand-out features. It holds its flowers well above the foliage and they are outward facing so displayed well. The foliage is beautifully marbled and interesting in itself. The flower colour is an attractive magenta-burgundy but without brown tones that often mute those colours.

I did a search to see if I could find the breeding but all the internet tells me is that it is one of the “Rodney Davey marbled group”, Davey being the breeder. Fair enough – it is the work of a dedicated hellebore specialist and if he does not wish to disclose the breeding, that is his right. Looking at it, our guess is that it probably has quite a bit of H. niger in it, in which case to get this strong colour into that species is a real triumph. It is the way the flower is displayed that makes us think of niger (some of you may grow “White Magic” with its upward-facing flowers). While there are similar burgundy colours in the H. orientalis group, none of them display their flowers as well and we have yet to see these combined with such attractive, marbled foliage.

The breeder lives in the south of England and the plant was named for prominent garden writer, Anna Pavord. Fortunately, due to the wonders of micropagation (tissue culture), the plant has been multiplied hugely and is available everywhere that I can see, in both this country and overseas. It is worth having and no, I was not given a plant to review. We truly did spot it in a garden centre and buy it.

First published in the Waikato Times and reprinted here with their permission.

Garden Lore

“A little studied negligence is becoming to a garden.”

Eleanor Perenyi Green Thoughts (1981)

Neither spray damaged nor sickly – just hard to use well

Modern heucheras

Having used Plant Collector this week to whole heartedly recommend a new plant, the same can not be said for the yellow and orange heucheras which you will also see in almost every garden centre. I have long raised my eyebrows at these and photographed some clumps on our recent garden ambles, garnering agreement from a number of other gardeners that not all heucheras are equal and some may be best avoided.

Heucheras are North American leafy perennials and have proven most amenable to the whims of the hybridists. Not all are a triumph in terms of garden performance and appearance. The lime green form looks attractive and useful but a retailer told me it is not as reliable as the others. This discouraged me because, despite considerable efforts, I have never been very successful growing the handsome deep burgundy foliaged ones. I have, however, admired them in others’ gardens where they make an attractive show.

It is just those yellow and orange autumn tones. Novelty plants, I call them. Plant them out and how do they look? Spray damaged, is Mark’s verdict. Sickly, I say. I have never seen those particular coloured heucheras used in a way that is attractive. Be cautious of novelties. I am reserving judgement on the coral shades at this stage.

Just don’t do what I saw one gardener do – buy one of each colour and plant them in a ring around the base of a deciduous tree. Not only will they suffer from root competition, it is the look of a novice gardener.

Great nursery plants – the autumn-toned heucheras look so interesting in the garden centre but I have yet to see them perform as garden plants

First published in the Waikato Times and reprinted here with their permission.

Modern directions in perennial planting patterns

1) Confining planting to geometric blocks (Mondrian-style perhaps, for students of art), has been evident in show gardens in recent years but has now become mainstream. This is a new planting on Hampstead Heath, done by the public authorities. The sharp lines will blur over time. It is a shame about the buxus blight that is already evident. A different clipped shrub may have been a better choice.
Wisley 2) Piet Oudolf’s rivers of colour in the modern borders at Wisley have been controversial since they were planted in 2000, but we think they are glorious. They also take much less labour to maintain than the traditional twin herbaceous borders. Each ribbon of colour has about four different plants in it and the colours will change through the season. You need to be able to look up or look down on this type of planting (or both). Viewed on the flat, you would not see the diagonal effect.
3) Less ambitious may be to snake a river of one perennial through clumping plantings. In this case it is an erigeron daisy but I have already done it in my own garden with irises (the blue sibirican ones and also Higo iris). A river effect alters the dynamic of big, round clumps of plants or can give some visual unity to an otherwise disorganised planting.
4) Big generous clumps of perennial plants, each standing in its own space, are one of the hallmarks of the New Perennials Style that has been widely adopted in modern UK and northern European gardens. This is a private garden, the work of British designer, Tom Stuart Smith. It takes a big area to carry out well. Each plant is occupying an area at least a metre across, sometimes more. Clipped shrubs act as punctuation points.
5) The classic cottage garden mix and match style is harder to manage than it looks if you are determined to keep both a succession of flowers and good coverage – to avoid bare patches – throughout the warmer months. This is in a Dorset garden owned by a good gardener. In lesser hands, it can become a hodge podge with bare bits and small plants of potted colour added in an effort to fill in the gaps.
6) The classic twin herbaceous borders adapted to a more personalised, private garden (in this case Gresgarth, near Lancaster) by breaking up the expanse into shorter sections using clipped hedging in battlement style and strategic topiary. In line with modern expectations, planting is now deliberately colour-toned and separate sections allow the colour palettes to be kept apart. The effect is deliberately refined.
007 - Copy 7) Grasses! Grasses! More grasses! And many meadows, let alone prairie plantings. No discussion about modern perennials is complete with referencing these major trends. These deserve attention in greater detail and are part of a bigger picture of focussing on more environmentally friendly approaches to gardening.