Moss Island, October 2024June 2019 – Old rubbish collected from the forest as part of the Gahnia Grove restoration project is piled beside the orange tape, marking this extension of the Gahnia Grove chemical-free weed control trial and restoration project. The weedy grass area on the left was later cordoned to become part of “Cherry Bay”, and in late 2020 Moss island was created there.Cherry Bay in July 2020. Moss Island was created later that year, in the area of grass behind the cordon, between the foreground and the big clump of harakeke. Cherry Bay is the whole area behind the cordon on the right, visible from the lower right-hand corner of the upper field of Eskdale Reserve in Glenfield RdJuly 2020: The grassy area to the left is where Moss Island was later created. The lower trunk of the big cherry tree can just be seen on the far left of the photo.
In 2020 during Auckland Council’s construction of a new forest track for cyclists and pedestrians, we asked their contractor RAM Contracting if they could save a little of the beautiful moss-covered clay bank which had to be excavated to widen, pave and channel the track for its new use.
Native mosses, shrubs, creepers, fungi and tree seedlings lined the old forest path along the top of the ridge
The RAM Contracting team kindly agreed, and brought a digger load of large clay pieces out of the forest to the edge of the playing field below Glenfield Rd.
At our request they placed the pieces together in “Cherry Bay”, a damp weed-grass covered area just behind the Gahnia Grove cordon (see photos at top of page), where we could weed around it a few times a year while observing what happened to its covering of native mosses and gum-lands tree and shrub seedlings.
Below, some close-ups of Moss Island in March 2021.
Moss Island after the summer: Milk moss, with seedlings and young tangle fern, mingimingi and tanekaha, and a little invasive Creeping buttercup creeping in from the surrounding “weed sea”.Mingimingi seedlings – and a single kanuka seedling (top right), supported by the mostiure-retentive milk mossClose-up of the milk mossA mingimingi seedling in milk mossThree kanuka seedlings in milk moss with tanekaha leaf litter from the older forest A tanekaha seedling (centre), in milk moss, with tanekaha leaf litter from the older forestDianella nigra seedlings in milk mossa juvenile mongimingi in milk moss – with a stem of the invasive Lotus pedunculata creeping in from upper rightA kanuka seedling (centre), in milk moss, with tanekaha leaf litter from the older forestThis brown tanekaha seedling may have died, or may be among those that survived and flourished the following yearInvasive Creeping buttercup creeping into milk moss
The big vine and shrub weeds and most of the tree weeds had been manually controlled in Cherry Bay in 2019, and wild revegetation was progressing well, but this particular part of it had little shade overhead, and gets very wet in winter, so it fills with Creeping buttercup and grasses every autumn.
The buttercups creep into the mossy clay and are weeded out by hand, and the “sea” of weeds around the “island” of native forest, so we keep the weeds down with a heavy mulch of dead wood, cherry and harakeke prunings, pine litter from under nearby pines, and any weeds that can be easily uprooted or cut down around it.
A mulch of Harakeke prunings helps suppress weeds in Cherry BayMoss Island in July 2021, the area around it recently weeded and mulched with woodchips (by the cordon) and harakeke prunings (under the trees)
As expected, the larger tree seedlings growing in the clay pieces died not long after, but the native “milk moss” (Leucobryum javense) and many of the native tree and shrub seedlings are thriving, four years after translocation of their clay bed.
Moss Island in September 2024 – kumerahou left of centre
We are grateful to RAM Contracting for their understanding of and collaboration with the Gahnia Grove restoration project’s objectives, and their cheerful contribution of time and equipment in creating Moss Island.
Kumaraho (Pomaderris kumerahou, or “gumdiggers’ soap” , a seedling among the moss, now standing about 50cm high at the front of Moss Island in September 2024September 2024: New leaves on Moss Island’s largest kumerahou juvenile
Tomorrow, Sunday 1st September, we will be selling our remaining large Kawakawa and Carex flagellifera at half-price: $5 for the 12-15cm pots and $4 for the 10cm pots, at our native plant stand on Glenfield Rd opposite the petrol station….while stocks last.
Kawakawa fruit are a big drawcard for kereru. Male and female trees are needed for fruiting, and you can’t tell which is which until they flower at about 4 years of age, so plant half a dozen. They grow in sun or shade but do best in part shade, and need moist soil in summer. The kawakawa left of centre and on the right below are growing wild among Carex and other natives.
Carex flagellifera self-seed and multiply by division, filling a space to hold the soil and crowd out weeds . They are tolerant of dry or wet soil, in full sun or part shade. These have multiplied in a gap between harakeke on Glenfield Rd, and karamu are growing wild with them:
Along the new track through the upper margin of Eskdale Forest, bare clay is turning to a variety of native plants, many of which only grow in kauri forest. These gracefully drooping young plants hanging over the edge of the track are Gahnia xanthocarpa, sometimes called “giant cutty grass”, a typical component of kauri forest where sun reaches the forest floor.
Almost impossible to propagate, they are so well-designed for the harsh environment of low-fertility kauri lands that they have sprouted up all along the exposed clay banks lining the track across the top of the ridge.
There are a few adult plants among them, their black seeds hanging from tall brittle stems.
To fully appreciate the value and beauty of this pathside vegetation, see the same bank below in November 2020 during track construction, when this section of rutted clay bank had suffered temporary loss of even more of its trees, shrubs, sedges, ferns, creepers and mosses.
In 2020 during track construction
Look for even greater beauty and diversity as the years pass. For example, tiny native orchids depend on the ground being undisturbed, as they only appear above ground during winter. Where old ground has remained undisturbed, they can be seen along the path on almost vertical banks, vitally protected by fallen ponga fronds and leaf litter caught in the undergrowth.
This Grass-leaved greenhood orchid (Pterostylis graminea), which we saw yesterday, has probably reached its full size at about 6cms tall.
The North Shore Wilds native plant stand will be open tomorrow Sunday, opposite the petrol station on Glenfield Rd, from about 10am. Our larger plants need to be well rooted in damp ground before summer drought (unless they will be watered), so the largest Carex flagellifera have been reduced from $10-12 to $8.
Carex have long hair-like roots that penetrate and stabilize clay soils. Grown close together, in full sun or shade, they form dense hardy tufts that can be occasionally walked on, preventing soil compaction and erosion in wet weather.
Their seeds are the natural habitat for tiny… and harmless… native Carex beetles, which I have seen only a few times. I was amazed that this species had survived the 20 years since I sourced and planted these in my own garden.
Like most of our other plants, these are grown from seed ecosourced from the Kaipatiki area.
The photo shows three species of wild Kaipatiki-native Carex allowed to grow as they will, spreading to cover previously bare clay under a planted kawakawa and a wild nikau, in an 80cm wide strip of soil outside a dining room window that gives a great view of kereru feeding in the kawakawa in summer. (We still have small kawakawa trees for $3 each or 4 for $10.)
Our spaces are shrinking, but we can still have wild beauty !
Today at the plant stand on Glenfield Rd we have a “special” – 4 of the $3 kawakawa for $10. Kawakawa enjoy close plant communities and can be seen wild – or planted – in groups, under shade trees, and among other small trees and shrubs.
Having several of them gives you a better chance of having both a male and a female tree. Only the female trees will bear fruit.
Both male and female trees are needed for pollination of the flowers so they produce fruit. I dont know how near they need to be to each other. More info at northshorewilds.co.nz
Tomorrow, Sunday, I will be taking the North Shore Wilds baby plants (still priced from $3) for their weekly outing to Eskdale Reserve:). We will as usual be near the Flame tree opposite the petrol station. I will set up there every Sunday by about 10am, and maybe some Saturdays, through the planting season (or while stocks last).
We have had a lot of discussions there with customers, Reserve visitors and passersby, lately about landslips, natural overland flows, Kaipatiki’s many named and unnamed streams (including those that only flow in winter), and how to deal with seasonal excesses of water in the garden.
Auckland Council has lots of info about “greenfields” stormwater management and the restoration of dense vegetation to absorb water and stabilize soil. Recently I read a study which found that ti kouka (Cordyline australis, cabbage tree) is particularly good at this job. Its roots grow quickly and deep, it doesn’t mind “wet feet”, and it is a fast grower.
It also attracts birds, including kereru, to its huge bunches of glossy black fruit.
You can easily raise as many ti kouka seedlings as you want, merely by refraining from spraying, mowing or disturbing unused ground, identifying everything that comes up, suppressing problematic weeds, and supporting the ti kouka seedlings with a mulch of anything around… which includes most of the weeds you have pulled out or squashed down.
See what a good job the ti kouka and karamu are doing around the plant stand in Gahnia Grove! Road runoff pours down this steep bank, but the trees are absorbing the impact of the raindrops, drawing a lot of the water down into the ground for storage till they need it in summer, and holding the soil together. The dense ground covering vegetation further softens the impact of the rain, preventing loss of surface soil.
Groundcovering plants here still include some of the remaining harmless wildflower weeds, which we maintain for this purpose until they get shaded out as the young trees become dense.
More info about chemical-free weed control and ecological restoration of your garden at northshorewilds.co.nz
From time to time we feel moved to describe what we are seeing in our single-handed restoration project “Gahnia Grove“, covering about half a hectare of regenerating wild kauri forest along and below the Glenfield Rd margin of Eskdale Forest.
The site has three major sections – Tanekaha Ridge, Rimu Ridge, and Gahnia Grove-the-original-2018-roadside-site, in June 2018 almost nothing but vine, shrub and tree weeds with uncontrolled kikuyu tangled in honeysuckle and blackberry,
Honeysuckle smothering native forest edge
so that area was the most urgent, and made the most difference to the survival of the forest hidden behind it – see below:
At random, then, these notes from a visit last week to “Flame Tree Bank”, visible from the roadside just uphill from the strawberry stand:
Plant species diversity beginning to increase on Flame Tree Bank
Flame Tree Bank is part of the initial 2018 Gahnia Grove restoration project. It comprises the slope around the big stand of Flame, or “Coral”, trees, from the edge of the forest canopy, uphill to the recreational mown kikuyu area bordering Glenfield Rd, nearly opposite the petrol station.
In 2018 Flame Tree Bank was completely dominated by environmental weeds. The entire tangled mess, on a steep slope above regen kauri forest margin, was (and remains) overhung by invasive Flame trees. One of two trees planted in 1999 has spread through suckering and falling branches, becoming over 30 trees, most of them now occupying space in the canopy of regenerating kauri forest.
After a request to Council for intervention when we initiated our restoration of a section of forest margin we called Gahnia Grove, these trees were expected to be controlled by arborism.
Above: Flame Tree Bank in May 2018, with Elephant’s Ear, Arum lily, Cape Honey Flower, honeysuckle and Tradescantia, and kikuyu in the foreground
Below: Jan 2019: after honeysuckle was controlled by uprooting it wherever it was easy, and rolling it up, invasive bindweed took over.
The planned arborism would have destroyed or smothered much of any regen present by that time, so we did not attempt to maintain much weed control here till 2020, when it became apparent that there would be no Flame Tree control by Council.
( On the positive side, this meant the site was not subjected to the injection of poison prescribed to accompany the arborism. And over the years since 2018, necessity being the mother of invention, we have discovered we can manually control all but the largest trees, through partial breaking of branches and ringbarking of small trunks and lower branches, both of which procedures appear to have suppressed or slowed growth in the large trees of the smaller stands, while eliminating the small trees in the forest itself).
So in 2018-19 on Flame Tree Bank we controlled only honeysuckle, bindweed, ginger, Alocasia, Arum, moth plant, extensions of Flame Tree invasion, and kikuyu, allowing the more benign weeds including Tradescantia to maintain ground cover and suppress spread of environmental weeds.
Above: The second image shows Flame Tree Bank in October 2021, after control of vine and shrub weeds, with only a few wild native plants (shrubby toatoa and karamu) emerging so far among the ground-covering weeds . (The top half of the cabbage tree on the right was knocked off by a falling Flame Tree in 2020, so it is now half the size, and has grown a new head)
During hundreds of explorations and interventions, only 12 wild native plant species were observed on this bank from 2018-2023. In addition to the wild regen, only a dozen or so 10cm H nikau seedlings were planted.
The new wild native species seen were very young seedlings released from Tradescantia in 2019
Karamu seedlings in thinned Tradescantia Ti kouka seedlings released from Tradescantia
and later dying (due to natural attrition or drought). These seedlings were ti kouka/cabbage tree, karamu, and a few kahikatea.
The forest canopy edge down the bank had been released from Tradescantia in late 2018, and the same species of seedlings were found beneath Tradescantia regrowth in 2019:
Karamu seedling and moss in thin Tradescantia regrowth on vertical bank
This week, under the shelter of the rapidly developing regen spreading from the boundary of Flame Tree Bank top with the adjacent Cape Honey Flower (CHF) Bank top, we found:
a single mapou seedling
a single Pteris tremula sporeling
2 Hebe (Veronica stricta) seedlings
Hebe seedling
and several Carex lambertiana – with more karamu seedlings, which have become common on Flame Tree Bank since 2022.
Juvenile Carex lambertiana, released Jan 2024 from Tradescantia regrowth and creeping buttercup
These 4 modest finds are all well-situated among 2-3 year-old native regen not likely to be overtaken by weed, drought or flood, and while not extraordinary or even of note in other situations, they indicate significant progress here.
A very weedy site gives enormous rewards, through the contrast of ugliness, waste and destruction with the harmony seen in emerging native plant communities, and the lush growth in sheltered soil enriched with the composting weed material.
We hope to find time to present some other views of Gahnia Grove before, during and after the ongoing restoration.
We have re-activated our little cottage nursery that supplied Council restoration projects and home gardens from about 2004-2006. Hundreds of native seeds fall and grow, even in our own little garden and gravel driveway, so we have been potting them up in recycled pots with roughly-composted wood chip mulch so our garden restoration clients can have free plants for planting season (or earlier if they have a loose soil and are prepared to water them…but Autumn is much easier!)
We are now offering 10-20 plants (depending on size), in a limited range of species – this year we concentrated on kawakawa, karamu, nikau and Carex – free with every 10 hours of gardening or habitat restoration, while stocks last.
We will look after the plants till autumn.
Here’s what they look like at present:
North Shore Wilds nursery plants, November 2023NSW nursery plants November 23
In the 5 months we have been working with some of our gardening clients, they have learned to recognise and make use of the wild native trees, shrubs and grasses that spontaneously grow all over the North Shore, from the soil’s seedbank from former forest and wetland, or from seed and spores brought by birds or wind.
In this time, even small areas of mown lawn, or gardens containing only the common non-native ornamental species, have produced a few tanekaha, rewarewa and kahikatea seedlings, lots of baby Cabbage trees (Cordyline australis), five-finger (Pseudopanax), Karamu (Coprosma robusta) and mapou, (often referred to as Pittosporum, though it is actually Myrsine australis), and numerous native grasses, sedges and creeping ground covers.
Wild tanekaha seedling hidden among Clivia in a small garden of ornamental shrubs
Of course, those who are lucky enough to have a patch of native bush in or beside their garden, and some undisturbed areas of ground, have seen all kinds of forest species emerge and thrive, including native vines, ferns and orchids, and the less common “forest giants” like tanekaha, kahikatea, rewarewa and kauri.
wild karamu seedlings found among ivy and other weeds in a large weedy garden, a small area of which is now being restored to dense wild native vegetation
wild rewarewa seedling discovered while weeding under a Norfolk pine, now protected with some cut ivy and uprooted weeds
For new clients, or as a “stand-alone” service, we provide a 1.5 hour assessment of your garden’s potential for visual transformation and the recreation of diverse native pant communities, solely through plant identification, soil protection and chemical-free weed control.
