Author Archives: Abbie Jury

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About Abbie Jury

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Outdoor Classroom – Rhododendrons: common problems and solutions

1) Silver leaves. By far the most common problem is thrips sucking the chlorophyll out of the leaves, turning them silver and weakening the plant. Turn the leaf over and you may find black, thread-like insects on the back. Replace heavily infested plants – some varieties are more susceptible than others. Open up around the plant for more air movement and light. You can use a systemic insecticide – spray November, early January and, for really bad cases, late February. Neem oil is recommended by some as an alternative to insecticides.

2) Leaves with dry brown patches and edges. This is usually a sign of stress. The plant may be too dry or too hot. Move it if necessary (sun for half the day or dappled light is best) and get a blanket of mulch over the roots. Some varieties prefer a much colder winter than we have and these tend to burn and crisp on the leaves. Replace them. Some plants get touched by mildew and lichen. Open up to allow more air movement.

3) No flower buds. This is usually a sign of too much shade. Move the plant or open up around it to allow more light.

4) Leggy, bare and stretched. Again, this is usually a sign of too much shade. Some varieties have a tendency to get rangy and open, others are naturally more compact and bushy. You can rejuvenate a leggy plant by cutting back very hard but it is really too late in the season now. It is best done in the middle of winter. You are more likely to kill the plant if you cut it back to bare wood now. This plant was cut back hard two months ago and has made its new growth already.

5) Plants which make only one new growth from each stem can be encouraged to make several growths by pinching out the single shoot. Do this as early as you can or you will be pinching out next year’s flower buds. In the right hand photo, you can see a plant making several new shoots instead of only one.

6) If not deadheaded, some rhododendrons set so much seed that it can weaken and even kill them. It can also reduce flowering the next season. This plant missed being deadheaded last year. Varieties that don’t set seed are generally deadheaded for aesthetic reasons, not because it is necessary.

Tikorangi Notes: Saturday 23 October, 2010

Latest Posts: 23 October, 2010

1) Rococo gardening in Portugal – the garden at the Pink Palace in Queluz.

2) A lilac that is happy in our mild climate with acid soils: Syriniga palibiniana from Korea.

3) Our hints for garden tasks for this week.

4) It is only one week out from the single biggest event on our garden visiting calendar in Taranaki – Counting Down to Festival.

The fluffy pink pompoms of Prunus Pearly Shadows
The fluffy pink pompoms of Prunus Pearly Shadows
Rhododendron Bernice flowering this week

Rhododendron Bernice flowering this week

Tikorangi Notes: 23 October, 2010
With under a week to go until the start of the Taranaki Rhododendron and Garden Festival next Friday, the pressure is on to complete the garden preparation. Expectations are high when it comes to standards of presentation and grooming here. With various factors mitigating against meeting our deadlines this year (an appalling early spring of wind and rain, the odd bout of illness and injury, not to mention my disappearance overseas for three weeks), we have been grateful for extra assistance from some able friends this week. The plants are unconcerned by the flurry of activity – rhododendrons and azaleas opening every day, Prunus Pearly Shadows is a picture, the Scadoxus puniceus are eyecatching and everybody asks about the arisaemas (Mark’s hybrids). It promises to be as colourful and fragrant a display as ever.

Rococo Gardening in Portugal

Just one of the eclectic collection of water features

Just one of the eclectic collection of water features

I had been warned not to expect too much of Portuguese gardens. That is despite Portugal having a much more equable gardening climate than neighbouring Spain. But there are only so many castles, palaces, cathedrals, ruins and medieval towns one can absorb and I am happiest in a garden. So when I reached Lisbon, I had already planned a couple of days of garden visiting. Sintra is a small town in the hills 30 minutes beyond Lisbon and it seemed the place to be with no fewer than three gardens of note in my guidebook to European gardens.

Alas the day did not go to plan. The light rain in Lisbon translated to very heavy rain and wind in Sintra. With the best will in the world, my sodden footwear, lack of raincoat and a small umbrella which was giving up the ghost and blowing inside out were simply not equal to the task. The water was teeming down the roads and visibility greatly reduced by mist. The gardens of Sintra were destined to remain a mystery though I could see why they were lusher and greener than other areas.

With intermittent showers the following day, I was not going to make the mistake of returning to Sintra but opted instead for the gardens at the Palacio de Queluz, a mere 15 minutes by train from Lisbon and hailed, in my guidebook, as “the best rococo gardens in Portugal – perhaps even in Europe”. I vaguely recalled Elton John’s garden in the UK being described as rococo and, had I thought about it, I may have conjured up a mental image of gilded cherubs and heavy decoration in the Baroque style. That doesn’t even hint at the extent if it, although there was no gilding.

Borrowing from all styles of history

Borrowing from all styles of history

Up until my visit to Queluz, Britain’s Prince Regent, George, held the crown of naff in my books with his self-indulgent, OTT royal pavilion in Brighton. Restrained good taste is not synonymous with breeding and wealth. A penchant for flamboyance will triumph and the gardens at Queluz left the Royal Pavilion for dead. To be honest, the whole thing was a little down at heel but European countries have an abundance of historic places to maintain at vast expense, and I am guessing that the palace at Queluz may be rated as less important than other premier attractions in Portugal. The palace was pink. Yes, pink and palatial in proportions, though most of it was only double storey. The whole shebang dates back to the 1700s and the royal family of Portugal used it as a summer retreat, somewhat akin to Versailles in France. The exterior of the palace itself was heavily ornamented and the gardens, the work of a French jeweller of the time named Jean-Baptiste Robillon, were designed to spread out from the front of the palace.

This rococo garden was all about simplicity of form overlaid with elaborate ornamentation. So there were long avenues radiating out and formal gardens, all defined by clipped buxus and pencil cypresses. Form is everything and I was struck by the importance of allowing sufficient space for wide paths. In New Zealand where we specialise in large gardens, too few demonstrate the courage of allowing generous paths, wide enough for maybe six people to walk abreast comfortably. It gives a sense of space and grace in a larger area.

More about style than plants

More about style than plants

Plants were just soft furnishing in this garden. There was nothing of botanical note – some Magnolia grandiflora from America (introduced to Europe around the 1730s but I don’t think these were original plantings), agapanthus, lindens, planes and eucalyptus. Waist high buxus hedges were of clipped sempervirens, shoulder height ones looked to be Buxus wallichiana. Formal gardens were defined by buxus hedges but often the compartments merely held a citrus tree or were left empty. In one area, clipped buxus was planted in a series of serpentine waves. It is all about form and shape, not about plant interest.

Add in the ornamentation. At every turn possible. The more elaborate and detailed the better. Goodness only knows how many statues and water features, scalloped pools, round pools, a large rock waterfall (with no water running on the day I visited and stuck in the middle of long vista so it made no logical sense and merely looked contrived), tiling, balustrades, urns – the more the better. Stylistically, the ornamentation is borrowed from pretty much every period in history. The exuberance was overwhelming.

A hint of mausoleum style in the canal garden

A hint of mausoleum style in the canal garden

Gild the lily further

Gild the lily further

The piece de resistance were the tiled canals at the end of the garden. A natural stream had been channelled through paved canals, designed with locks so that the water could be held back to raise the level, apparently to hold barges filled with musicians to entertain the royal family and their guests. Pity the poor peasants downstream whose water could be withheld at the royal whim and then possibly released in a wild woosh.
The canals were lined inside and out with glazed tiles predominantly in blue and white (though sometimes in yellow, blue and white), depicting murals of shipping scenes, courtly matters and still life representations. These have withstood the ravages of time over several hundred years and are still in good condition and quite bright. Apparently the Portuguese, like the Spanish, are happy to gild the lily even further- in a heavily decorated scene, add some more detail – so colourful urns adorn the plinths, statues stand guard and steps are constructed and tiled in a manner reminiscent of a mausoleum. The effect was quite astounding.

This is not a style of gardening that is intended to sit easily in the landscape with boundaries between garden and nature blurring, in the style of the English romantic tradition. Nor does it have anything to do with the Japanese gardening traditions of symbolism, restraint and control. It is a long way from the Moorish traditions next door in the south of Spain which are all about restfulness, shade, cool and controlled use of spaces. This is more akin to the historic version of Kath and Kim: “Look at me! Look at me!” It is an ostentatious show of wealth with a certain frivolity within its extravagance and flamboyance. Decoration and ornamentation are the dominant features. I am not surprised if indeed Elton John has the late twentieth century version of a rococo garden.

As a final thought, when our children were little, Para Rubber used to sell a blue, scalloped shell-like plastic affair for use a paddling pool. Possibly they are still around. I hadn’t realised that these had their derivation in the rococo style, along with the hinged clam-shell style of sandpit.

Plant Collector – Syringia palibiniana

Syringia palibiniana - Korean lilac

Syringia palibiniana - Korean lilac

We are not the world’s greatest territory for growing lilacs, those wonderfully fragrant cones of lilac blooms in spring, which is why you don’t see them around this area a great deal. They favour a more continental climate with cold winters and, preferably, hot summers, heavy soil and more alkaline conditions. Taranaki with its friable, volcanic soils and very mild climate is at the opposite end of the scale. But this dwarf Korean lilac is wonderfully adaptable to our conditions. It doesn’t have as strong a scent as the common lilac (Syringia vulgaris), but it is sweetly perfumed and makes a compact little shrub to about 100cm x 100cm. Like all lilacs, it is deciduous and when its little leaves appear, they are completely in scale to the dainty flowers and the small habit of growth. It is one of those handy little shrubs that you can fit in anywhere in the garden which gets reasonable sun and it will delight you at this time each year as it opens its many panicles of little lavender flowers.

In the Garden: October 22, 2010

· While Labour Weekend is the traditional time to get the The Great Summer Veg Plant Out done, the lingering cool temperatures, wind and rain have mitigated against it this year. The soils have not had much of a chance to warm up yet. Don’t rush it especially if you are in a cooler, inland area. A week or two is neither here nor there.

· Priority for planting out when conditions are suitable are the crops which require a long growing season which include aubergines, capsicums, cucumbers, both rock and water melons, kumara, tomatoes and corn. If you have starter plants of these in small pots under cover, be careful about planting them straight out in the open in either blazing sun (unlikely) or torrential ran. You may need to give them some protection while they get established. Cut off soft drink bottles can work as can plastic bags held up by sticks if you don’t have a cloche. A single sheet of newspaper will protect them from the bright sun. You can avoid this by hardening them off gradually over several days by exposing them to a few hours of direct sun only.

· If you are not planting out the little plants yet, make sure that they don’t get set back by being held in pots that are too small or by forgetting to water them. They rarely recover well from such set-backs.

· Clematis are rocketing away and most need something to climb up. If you leave them any longer, you will cause a lot of damage trying to get them to grow in the right direction. A bamboo tepee is a quick and easy solution.

Greeblies in the cordyline

Greeblies in the cordyline

· The caterpillars that chew holes in our native cordylines (cabbage trees) are at their most active. These are the progeny of a native moth (which is why NZ cordylines overseas look so clean and smart). On small plants, running your hands up the base of the tufts of leaves can effect a good kill. On larger plants, if you want clean foliage, you will have to spray with an insecticide. If you look, you may be surprised at what other greeblies your cordyline is hiding, including slugs and snails.

· Esteemed colleague, George Fuller, tells us that it is not a rust that causes orange blotching on renga renga lilies (arthropodium) but in fact a nematode (or wire worm). These critters can build up in a patch over time so if it worries you, it may be necessary to resort to using a systemic insecticide. A systemic insecticide is one that the plant absorbs as opposed to contact insecticides which only kill with a direct hit. The nematode is actually in the plant and it is the same one that attacks chrysanthemums and black currants, answering to the name of afelenchoides ritzemabosi.

· As evergreen azaleas finish flowering, it is time to trim them. These are a forgiving plant which means you can trim back to bare wood and they will shoot again but do not delay if you plan on cutting hard because you want the plant to be flushing with spring growth to help its recovery.

· It is safe to plant both green beans and runner beans now. These are very worthwhile crops for the home gardener, giving good yields and planting successional crops of green beans two weeks apart will extend the harvest season.