Nelson Bay Native Plants
Photographic reference of Australian plants native to the Tomaree Peninsula

Native violet colonises drainage lines after rain

When a coastal low finally dumps its rain on the Tomaree Peninsula, the bushland does something it rarely does: it runs. Water sheets off the low sandy hills, gathers in hollows and follows the drainage lines towards the wetlands and the ocean beaches. In the wet scrapes beside those channels, tucked between sedges and the brown stars of a wet stone, a violet appears. The plant is Viola hederacea, the native violet, and it is a specialist in exactly this kind of ground — damp for a few days, then dry and pale for the rest of the year.

That window is short, so most people walk past the discovery without noticing. It takes an early start after a solid fall, boots rather than runners, and the habit of following the water rather than the path. The contributors to the Tomaree Peninsula site work that way: photographs taken within days of the rain, notes recording soil, aspect and shade, and cross-references to the herbarium and taxonomic database so that a field image can be checked later against a pressed specimen.

What makes the flush worth documenting is how ordinary the violet is everywhere else. It grows in shaded gullies, along creek margins and in the cracks of old pavement across Australia. On the peninsula the drainage lines concentrate it into ribbons that are conspicuous and short-lived, and a good set of images captures the whole species in a single afternoon. The records age quickly, which is precisely why they are worth keeping.

Where the water runs on the peninsula

The Tomaree Peninsula sits between Port Stephens and Lake Macquarie, a low plateau of coastal heath and open eucalypt woodland cut through by seasonal drainage lines. Sand lies over clay, with swamp soil in the hollows around the wetlands and a scatter of ironstone gravels in the deeper incisions. Rain falls in bursts rather than steady drizzles here; a wet week in March can deliver what three months of fine mist never manages, and that single event is enough to reorganise the ground layer of the bushland.

Localities worth trying include the rear margins of the coastal reserves, the shallow gullies behind Fingal Bay, the swales either side of the Wattamolla stairs, and the grassed nature strips along suburban streets in Nelson Bay and Salamander Bay where stormwater is piped to a low point and stands for a day or two. Council-managed reserves around the peninsula are maintained with a weed spraying program in spring, and the same lines that hold water are the lines that get treated, so timing a visit before the boom turns up is worth a thought.

The bushland itself carries the marks of the season, including hazard reduction burns in the drier years and the blackened stumps that follow the pre-summer fire risk warnings. Those burns open the canopy and bare the soil, which suits a plant that wants mineral ground and light. The Coastal Track between Soldiers Point and Wattamolla gives access to most of the relevant country on foot, and the climb down the beach steps after a storm is a reliable way to reach ground that holds water longer than the dunes do.

Recognising the native violet

The native violet is a small, delicate herb with leaves that are round to kidney-shaped, usually one to three centimetres across, with softly crenate margins and a shallow notch where the stalk joins the blade. The leaves sit on slender petioles that lengthen as the plant matures. Flowers are white to pale lilac, veined purple, with the lower petal the largest of the five and carrying a short spur behind the flower; a deeper violet blotch at the throat catches the eye when the plant is in full bloom.

Several species in the violet family can appear in similar situations, and the characters that separate them are small: the shape and length of the stipules at the base of the leaf stalk, the width of the petal spur, the pattern of hairs on the lateral petals, and the form of the seed capsule. A photograph taken close enough to show a leaf edge against the background soil will resolve more of these questions than a wide landscape shot ever will, which is why the site's records pair habitat images with detail shots.

In the field the species is usually found in sheltered, damp ground — the base of grass tussocks, the shaded side of a boulder, the seepage line under a fence, the damp margin of a drainage channel. It is the sort of plant that rewards kneeling down rather than scanning from standing height.

What the rain actually triggers

Violet seed persists in the soil for years. The ripe capsule splits and sheds small, hard-coated seeds, and ants carry them away from the parent plant, tucking them into cracks and the margins of disturbed ground. Germination needs a sustained pulse of moisture rather than a single shower — a few consecutive damp days, a drop in temperature and light at the surface. Coastal winters are mild, so one good soaking followed by cool nights is frequently enough to bring up a flush, which explains why a solitary storm can produce a meadow that persists for a month.

The flush is also a competition. Grasses germinate fast in the same scrapes and shade the seedlings within days; mosses and liverworts claim the wettest edges. The violet gains ground where runoff has scoured the surface, where the water carries fine leaf litter and dissolved nutrients into a pocket of bare soil, and where earthworms work the damp layer. Its root system develops quickly in that window and then holds on through the dry season, and the plant reserves its flowering and seeding energy for the following spring.

The result is a population that swells and shrinks with the rainfall rather than spreading steadily. The same line that produced dozens of plants one September may hold three the next, and a colony can persist for a decade without moving far from where it first appeared.

The short life of a coastal violet meadow

A good display runs three to five weeks. Late August into September the flowers give way to swelling capsules, the leaves yellow and collapse, and by October the ground is dry sand and stubble again. The rhythm is familiar from the arid country, where plants put out a whole season of growth after outback rain and vanish before the heat arrives. The site's coverage of the ephemeral desert everlasting draws that parallel directly, recording a plant whose entire visible life is tied to one soaking of the desert floor.

Ecologically the coastal flush still does the ordinary work of a wildflower patch. Small native bees and hoverflies work the nectar spur, and the open flowers are accessible to the short-tongued insects that other plants in the same community have already finished offering. Leaf miners and caterpillars feed on the foliage, and the capsules feed the ant population that disperses the seed. For people, the appearance of wet-season flowers on the peninsula functions as a signal — the kind of news that gets mentioned at the Saturday market in the Nelson Bay town centre and passed on between mates on the Coastal Track.

Gardens, nurseries and the local plant trade

In cultivation the native violet is treated as a groundcover for shaded, damp positions beneath shrubs and in the company of ferns and sedges. It tolerates a soil that dries out between waterings far better than most garden violets, and it responds to leaf litter rather than fertiliser. Propagation from fresh seed is straightforward: sow onto a fine, moisture-retentive mix, keep the surface damp and shaded, and expect germination within a fortnight of the seed being collected. Division of an established clump works too, though plants grown from seed often establish faster and hold their low, spreading habit.

Australian native nurseries around the Hunter region and through Sydney stock the species, and it turns up in the plant stalls at Saturday markets and school fetes as a low-cost, easy plant for a shaded pot or a hanging basket. Buyers sometimes ask for "the native violet", which in the trade can also mean one of the ornamental hybrids sold under that name, so it pays to check the label and the botanical name before buying. Local provenance matters when choosing material, and wild-collected stock is both undesirable and, in many reserves, prohibited.

Gardeners in the area also need to weigh the violet against the weeds that occupy the same wet ground. Bitou bush and African olive dominate coastal bushland on the peninsula and are the target of repeated spraying programs, and those treatments can clear a drainage line at the same time as the violet is trying to hold it. One successful approach is to keep the violet in the garden bed, where it can be protected and watered, and to treat the wild population as a record rather than a resource.

Building the photographic record

Recording a flush properly takes a little planning. Photograph in place with a scale object beside the plant, shoot the leaf and flower characters as close-ups in the same light that shows the habitat, and note the date, the position and the rainfall that preceded the visit. The site's format allows for that detail, pairing each image set with the scientific name, a habitat description and a reference out to PlantNET and the herbarium collection, so a doubtful identification can be tested against an authoritative description.

Sharp images carry more weight than captions. The characters that distinguish one violet from another are almost all structural — stipule shape, petal hairs, the length of the spur, the way the capsule splits — and all of them read clearly in a good macro frame under the flat light of an overcast coastal morning. The wider accompanying Amelia photo library holds the supporting habitat and landscape frames that give those details a sense of place.

Students using the site for assignments, land managers reading the vegetation listings and bushwalkers checking a name against a photograph all draw on the same archive. Organising it by genus and by vegetation type — coastal salt-tolerant plantings, rainforest pockets, wetlands, bushland and heath — means the violet can be found through any of those routes, whether the reader knows the species name already or is working from the habitat it prefers.

Field notes for the drainage-line flush

Places worth checking soon after a soaking

Details worth writing down