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Coastal Dune Plants along the Tomaree Coast

We’re all familiar with a variety of sprawling plants creeping over the beach sand, with low bushes inland of the beach. Do you know which are natives, and which are weeds invading and displacing our natives. Here we’ll help you find out more and learn to distinguish them.

Plant communities growing on beaches and dunes are influenced primarily by the sand they’re growing in (substrate), wind and salt spray.

Nearer the sea…
— the sand is lower in nutrients and moisture, increasing moving landward.
— exposure to strong winds, salt spray and sandblast is stronger, decreasing moving landward.

This usually creates three main dune vegetation zones — Strandline, Foredune and Hind dune vegetation — arranged roughly parallel to the coastline (Dune vegetation information adapted from Coastal Dune Plants Clarence Coast). The dune vegetation then protects the Coastal Forest.

Click on the heading below to find out about the plants in each zone.

More fact sheets will gradually supplement those below.


Native Coastal Plants

The Tomaree Coast has a wide range of native coastal plants which feature in different communities across the dune zones.

Strandline plants

Plants are extremely hardy and can tolerate salt spray, strong winds, sand abrasion and occasional inundation. On the strandline, hardy herbaceous stabilising plants nearest the sea include Pigface, Beach Spinifex and Fan flower. They grow with the foredune’s stunted windswept shrubs and trees.

Hairy or Beach Spinifex, Spinifex sericeus

Creeping grass with long stolons

Pigface*, Carpobrotus glaucescens

Succulent, sprawling herbaceous plant

Fan Flower*, Scaevola calendulacea

Vigorous trailing succulent ground cover, to small shrub – download factsheet
May twine through Bitou bush. Care needed not to confuse with young Bitou – download identification guide

Foredune plants

Scrub or woodland plants on frontal sand dunes, including windswept shrubs and stunted trees. Here stunted windswept shrubs and trees grow, along with the hardy plants such as Pigface and Fan flower also on the Strandline

Trailing Guinea Flower1, Hibbertia scandens1

Twining vine, can also grow shrub-like – download factsheet
May twine through Bitou bush. Care needed not to confuse with young Bitou – download identification guide

Coastal Wattle1, Acacia longifolia

Low spreading shrub, yellow flower – download factsheet

Spiney-headed Mat-rush1, Lomandra longifolia

A hardy strappy grass-like clump – download factsheet

Note 1: these plants are also found in hind dunes and coastal forests

Hind dune

Plants remain fairly intact when protected by a stable frontal dune. Plants in this zone have better access to soil moisture and nutrients than plants that colonise the foredunes and strandline.

Coast Banksia2, Banksia integrifolia

Tall shrub to small tree – download factsheet
Found in Forest, Volcanic Headlands and a variety of habitats

Coastal Tea-tree, Leptospermum laevigatum

Shrub or small tree – download factsheet

Snake Vine2, Stephania japonica

Vine – download factsheet

Note 2: These Hind dune plants also grow on the Foredune and are described in Foredune plants:

  • Coastal Wattle, Acacia longifolia
  • Spiney-headed Mat-rush, Lomandra longifolia
  • Trailing Guinea Flower, Hibbertia scandens

Coastal forests

Along the Tomaree coastline, the dune vegetation zones protect the forests growing on the sand mantle from the salt-laden winds.

  • Blackbutt Eucalyptus pilularis
  • Smooth-barked Apple Angophora costata
  • Saw Banksia Banksia serrata
  • Black Sheoak Allocasuarina littoralis
  • Monotoca Monotoca elliptica
  • Acacias, Peas, Epacrids, Boronias, etc.
  • Groundcovers, eg. Commelina cyanea

Volcanic headlands

More coastal vegetation communities grow on different substrates.

  • Stringybarks Eucalyptus sp.
  • She-oaks Allocasuarina torulosa/distyla
  • Acacia binervia
  • Honey-myrtle Melaleuca armillaris
  • Westringia W. fruticosa
  • restricted species: eg. Melaleuca groveana / Cryptostylis hunteriana

Moist gullies & drainage lines

  • Wet-adapted species, restricted locations
  • Blueberry Ash Elaeocarpus reticulatus
  • Sweet Pittosporum Pittosporum undulatum
  • Tuckeroo Cupaniopsis anacardioides
  • Ferns in understory, eg. Blechnum sp.

Freshwater swamps

More fact sheets to follow…


Invasive Coastal Weeds

Unfortunately coastal weeds establish among our dune vegetation. Some such as Bitou are particularly invasive, smothering our native vegetation.

Check out an overview of the Coastal Dune Plants workshop – Natives Plants and Weed Look-a-likes, for the Friends of Tomaree National Park and community, with the support of the National Parks Association and Hunter Region Landcare Network.

Strandline & Foredune weeds

Bitou Bush1, Chrysanthemoides monilifera

Ranges from low sprawling to erect shrub. Young Bitou particularly is easily confused with several native plants – read more about its Native Look-a-likes
Found in Foredune, Hinddune, Forest, Volcanic Headlands.
Highly invasive replacing native plants. High priority to control, designated a WONS, Weed of National Significance.

Milkwort2, Polygala myrtifolia

Small to large shrub, – read more about its Native Look-a-likes
Invades Foredune and Hinddunes, displacing native shrub layer. Medium priority to control.

Sea Holly Eryngium maritimum

Grows in exposed conditions though not persistent once shaded. Low priority to control from an invasive perspective, though recreationally unpleasant for bare feet.

Notes:

  1. Bitou Bush Chrysanthemoides monilifera (is also a Strandline & Foredune weed, as well as a Coastal Forest weed)Milkwort Polygala myrtifolia (is also a Strandline & Foredune weed)
  2. Milkwort Polygala myrtifolia (is also a Strandline & Foredune weed)

Hind Dune weeds

Asparagus Fern3, Asparagus aethiopicus

Ground asparagus forms dense blankets, crowding out native plants – read more here and here . High priority to control, High priority to control, designated a WONS, Weed of National Significance.
Eradication is by ‘Crowning’, watch you tube on crowning’ for removal

Chinese Violet3, Asystasia gangetica subspecies micrantha

A rapidly growing perennial creeper, able to completely smother vegetation, removing habitat and reducing biodiversity. Introduced to Australia at Boat Harbour. High priority to control, designated a WONS, Weed of National Significance – download factsheet

Notes:

  1. Asparagus Fern and Chinese Violet are found in Hind Dune and Coastal Forest, with Chinese Violet particularly problematic in moist gullies.
Published: 15 Sep 2021