Tag Archives: gardening

Plant Collector: Pachystegia insignis

Pachystegia insignis - one of our loveliest native plants

Pachystegia insignis – one of our loveliest native plants

We do a good line in native daisies in this country but few, if any are lovelier than this Marlborough rock daisy. The flowers are pristine white, but even when it is not flowering season, the leaves are big, rounded and heavy textured – glossy green on the upper side and felted white on the under side. That felting is called indumentum (sometimes tomentum).

In the wild, P. insignis grows on the eastern side of Marlborough. Apparently you can see it as you drive down the state highway but the only times I have driven it in recent times, I have been behind the wheel with my eyes fixed firmly on the road. It hangs onto the rocky banks, coping with drought and salt spray. This means it is not the easiest of plants to grow in a lush garden situation. It needs perfect drainage and an open, exposed site. Even then, we find mature plants can keel over and suddenly die from time to time.

To our ongoing embarrassment, our particularly good form here was stolen by my late mother from the Dunedin Botanic Gardens. She died 12 years ago (almost to the day), but her legacy lives on here. Pachystegias are small shrubs belonging to the asteraceae family. The “insignis” seems to mean distinguished or remarkable in this context.

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

Plant Collector: Nerium oleander

Oleanders - internationally popular for harsh growing conditions

Oleanders – internationally popular for harsh growing conditions

I photographed this oleander in Canberra which rather gives lie to the notion that these are sub tropical plants. Oleanders are so widespread internationally that their original habitat has not been isolated though it falls somewhere in the band stretching from Southern Europe and North Africa through to Central Asia. Some of these areas can get cold winters but what they all share is hot, dry summers. Years ago we saw oleanders used as street trees near the beachside motor camp in Gisborne. Not having been back there for some years, I don’t know if they are still there but similar conditions will apply in the drier, coastal areas of mid to north New Zealand. These plants are tolerant of both drought and salt spray.

Oleanders are evergreen and form large shrubs to small trees, several metres high. They generally grow with multiple stems and can be cut back hard without turning a hair though it may impact flowering the following season. Their tolerance for poor soils, hard conditions and drought means they can be grown in situations where most plants will struggle but it is their ability to flower freely for months on end that makes them a hugely popular plant of choice for many, despite lacking much natural form and elegance. Flowers are whites, pinks and reds, both doubles and singles.

Oleanders are renowned for being poisonous, but so are many plants including daphne. Just don’t ever use it in tisanes, herbal preparations, or anything else that may see you ingesting it. Never use them as kebab sticks. Yes somebody did, with unfortunate results. However, oleander poisoning incidents are generally deliberate rather than accidental. Mind the sap, too when pruning. It can cause skin irritation.

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

The call of gardening in less hospitable situations

Indubitably Australia

Indubitably Australia

I went to Australia last week – Sydney and Canberra. We have a daughter in each city and both are putting roots down across the ditch. Literally. It is very interesting watching one’s children become inspired by gardening.

Sydney daughter is the younger of the two and still in rental accommodation. But having lived in upper floor apartments before, she is now adamant that she needs outdoor space, be it ever so compact. Her current garden is not much larger than our dining room at home. I recall her growing huge and productive Sweet 100 tomatoes when she was a student at Waikato University. In an upper floor apartment in London, she acquired small window boxes to grow herbs. The current space, be it ever so modest, is palatial by comparison.

As the space also accommodates the accoutrements of modern life (outdoor dining table and chairs, barbecue and sun umbrella), her actual gardening space is limited to two narrow, raised beds along the perimeter and an assortment of pots. But she has made space for the two critical requirements for the hipster urban gardener – a worm farm and a covered compost box. She is limited to growing herbs and a few vegetables at this stage but I can see the makings of a lifelong gardener.

We could learn a thing or two from street trees in Australia - this pleasant leafy road is in in Canberra

We could learn a thing or two from street trees in Australia – this pleasant leafy road is in in Canberra

Elder daughter is now a proud home owner and that is an entirely different kettle of fish. She too started gardening as a student and is a reasonably competent vegetable gardener with over a decade of experience behind her. But now that she has some security and stability in her life, she is looking to expand beyond the quick turnaround of veg and herbs. She was after ideas to develop the ornamental garden.

Canberra is not the easiest of places to garden. Not at all. She commented it is not possible to put plants or seeds in with a reasonable expectation that they will grow and flourish. It takes hard work to get plants established. I walked around her pleasant, leafy suburb to get a feel for the place and it was clear that gardening was a challenge and it was the street trees that gave the area its appeal. We could learn a thing or two from street plantings in these Australian cities.

I realised, however, that this was not a place where that tenet of modern living applies – the indoor/outdoor lifestyle. That is because the winters are cold. I have visited in winter and I doubt that many people sit out in their gardens drinking their morning coffee, even on a fine winter’s day. The summers, on the other hand, are hot. Very hot, even as November became December. It was too hot to be outdoors after 10am and temperatures will rise considerably. So for a good six or maybe seven months of the year, it is an indoor lifestyle.

Then there is the dry. There has been a great deal more rain this spring than usual so the grass (one hesitates to call it lawn) is still green rather than dead. This is unusual.

There were clearly many who found the call of gardening too difficult so they just kept to a few trees and shrubs, mostly in hedges. Nandinas grow well, as do oleanders, crepe myrtles, camellias and pittosporums. The ornamental plum (a selection of Prunus cerisifera) is widely grown with its striking deep burgundy foliage which looked particular fetching with a white cockie feeding in it.

My advice to daughter was pragmatic. Because they have two small dogs (fur grandchildren, Mark and I call them), they only use the fenced back section, which now has a fine veg bed and a well organised compost alley. Concentrate her efforts there, I suggested, and indulge her interest in prairie gardening. It suits the climate.

What to do with a front yard which is merely access to the house?

What to do with a front yard which is merely access to the house?

The front can then become low maintenance window-dressing for kerb appeal. I suggested they get rid of all but one of the finicky garden beds and all the plant containers out the front. These need watering every day. What is more, the beds are raised which means they dry out even faster. Drop the level of the one remaining bed to ground level to reduce watering and the constant spillover of garden mulch. Plant that one remaining bed in easy care, shade tolerant plants – hydrangeas and hellebores – and retain the boundary hedges. Mow the rest. They only have to mow for four months of the year. I bought her my favourite tool for digging out the flat weeds. If you are stuck with fairly rough grasses, it looks much better without the flat weeds.

The same advice may well be applicable for people in coastal situations here. New Zealand lacks the extremes of temperature, but people gardening on sandy soils will experience similar problems. Emulating the lush growth more commonly prized in most gardens is fighting nature in such conditions. It is better to work with what you have.

Hydrangeas - easycare plants. They are all pink in Canberra.

Hydrangeas – easycare plants. They are all pink in Canberra.

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

Plant Collector: Swainsona formosa

The remarkable Sturt Desert Pea or Swainsona formosa

The remarkable Sturt Desert Pea or Swainsona formosa

Continuing the Australian theme this week, I was very taken by this striking flower, commonly referred to as the Sturt Desert Pea, after Charles Sturt who recorded it flowering extensively in central Australia during his 1840’s explorations. This particular plant was in a tub outside the bookshop at Canberra’s botanic gardens. The scant foliage was visibly leguminous but it was the flowers that were spectacular. They are up to 9cm long and bright scarlet with a showy black boss in the centre, held in clusters. They a little pea-like (as indeed wisterias are) but more distinctive than any pea I have seen before.

It is regarded as one of Australia’s showiest wildflowers. While native to the central and north western areas, it is found throughout much of the country so maybe it is worth a try here in a sunny, dry position. Generally it is a low growing annual, flowering in spring though to early summer before setting seed and dying off.

I bought a packet of seed, unsure on whether I could bring it in to NZ but figuring it was only $4 lost if it was confiscated at the border. There was no problem. It is on the list as being here already so is a permitted import. In fact doing it all properly and declaring it got me through customs faster than had I lined up with everybody else for baggage x-ray. I have seen enough to be a strong supporter of good border control.

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

Why viburnums send a shiver down Mark’s spine

Viburnum plicatum 'Roseace' - pretty as a picture

Viburnum plicatum ‘Roseace’ – pretty as a picture

In times gone by, we used to retail plants from here seven days a week for much of the year. My Mark was a reluctant retailer at best, though his plant and gardening knowledge is immense and he was perfectly capable of giving good advice if he liked the visitor. Alas, too often he would comment wryly: “That was one who put the cuss into customer”. He certainly never subscribed to the view that the customer is always right.

The mere mention of viburnums sends a shudder down his spine, even after a fair few years. A couple came in asking for Viburnum plicatum ‘Mariesii’ which they had seen growing in a prestigious garden. Mark checked that they understood this was a white lacecap variety and they assured him they knew what it was. Turned out they had no idea at all. Some time later, when the plant came in to flower and was not the common white snowball bush, the husband dug it up from the garden, put it in a supermarket bag and brought it back wanting a refund. He’d probably only paid $15 for a big plant of it. It was of course correct to its descriptive label (we take pride in such matters) and a fine specimen but it just wasn’t what he thought it would be. It is a bit like opening a packet of lollies, tasting one and then expecting to return the open packet many weeks later because you didn’t like the flavour.

I felt sure ‘Mariesii’ should be in flower for me to photograph – it is a beautiful big white lacecap flower on a large shrub with fresh green, pleated foliage and it tends to grow in layers like a cake. Mark and I agreed we must have it planted somewhere. We just can’t quite remember where. That is the problem of a big garden lacking records. It will have to wait in anonymity until we stumble over it again.

What started me thinking about viburnums were two plants which are looking particularly striking this week – ‘Roseace’ and one with the difficult name of V. sargentii ‘Onondago’. It took me a while to commit the second name to memory.

‘Roseace’ (sometimes ‘Rosacea’) is the pink form of the classic pompom viburnum, which is usually the form known as V. plicatum ‘Sterile’, or the Japanese snowball. It is a sport which was sold widely two decades ago and it forms a large, deciduous shrub to over 2 metres tall with an abundance of pretty, peachy-pink snowball flowers. That is at its best. Being a sport, it can revert to the more dominant white. We found this to our cost when we propagated a fair number from our main plant and then had to wait until they all flowered because only some of them came pink. Mark went through the original plant and pruned out all the white sections a few years ago but I see it is rather patchy pink and white again, though nevertheless very pretty and showy.

V. sargentii 'Onandago'

V. sargentii ‘Onondago’

‘Onondago’ is different, being narrow and upright. Its fresh spring foliage comes out deep maroon and lacecap flowers (like flat hydrangea blooms) have the tiny fertile flowers in deep red in the centre, surrounded by a ring of larger white sterile flowers. It is a selection out of the US National Arboretum in Washington and, being a seedling not a sport, it is very stable.

Viburnums come from a large family with over 150 different species identified. Most are from the temperate areas of the northern hemisphere so are generally hardy and are of the shrub/large shrub/small tree type. There are evergreen, semi evergreen and fully deciduous species. I am pretty sure it was the evergreen V. tinus I saw grown quite widely throughout Hamilton making a small tree that flowers in spring.

Balls of delicious fragrance from one of V. carlesii hybrids

Balls of delicious fragrance from one of V. carlesii hybrids

Earlier in the season, we had the somewhat short-lived delight of the waxy, fragrant balls of a couple of different ones. I am pretty sure they were ‘Anne Russell’ and x carlcephalum – both are hybrids from the Korean species of V. carlesii. We have them planted beside the driveway and the scent is easily as strong as a good daphne with more spectacular flowers, though their season is much shorter.

Most viburnums are very easy to grow, being not at all fussy about soils and conditions. They are a bit of an unsung hero, really, making good backbone plants which star when in flower and behave themselves for the rest of the year. Some of the deciduous varieties also give good autumn colour in inland or colder climates.

Just try and find out what you are buying before you plant it and don’t expect to dig it up and return it bare rooted because you made a mistake. Mark might have been more understanding over the ‘Mariesii’ had the customers been a little less know-it-all at the time of purchase. Instead he was intensely irritated, scarred now by the memory.

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