Gorse
Fabaceae - Ulex species
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What does it look like?

Gorse is a deep-rooted, woody perennial shrub that can grow to 4m tall. It has densely spined branches and is woody when mature. Gorse has bright yellow flowers from May to November, and black seed pods in summer. Gorse seed reserves in the soil are long-lasting and abundant under and near established infestations.

Grows well on a variety of soil types including light sands, heavy clays and disturbed soils. Its habitat includes river-beds, pasture, scrubland, forest margins and waste land.

Why is it a problem?

Gorse has the ability to occupy a wide range of soil types, and recovers easily after burning. It is quick to colonise new areas, forming dense thickets. The plant invades pasture land and roadsides as well as low growing or regenerating native vegetation.

An established hedge can produce up to 6 million seeds per hectare per year. Flowering begins when the plant is around 18 months old, with flowering usually occurring in spring and autumn.  In cold climates flowering may only occur once a year, but flowers can remain year-round when conditions are favourable.  Bushes can live for up to 30 years.

As a member of the nitrogen-fixing family, gorse can promote healthy soil-nutrient levels for native plants. Where native trees are to be planted, gorse can act as a nursery plant as it will die-off due to its shade intolerance, as native species will begin to create cover as the canopy develops.

Control Methods

Options:

  1. Stump swab: glyphosate (250ml/L) or metsulfuron-methyl 600g/kg (2g/L) or triclopyr 600 EC (250ml/L) or Tordon Brushkiller (100ml/L) or Vigilant gel.
  2. Spray (spring-summer): triclopyr 600 EC (20ml/10L) or triclopyr 300 EC (40ml/10L).
  3. Spray (autumn-winter): metsulfuron-methyl 600g/kg (5g/10L+ penetrant - knapsack) or (20g/100L + penetrant - spraygun) or Tordon Brushkiller (250ml/100L spraygun).
  4. Frilling: With a sharp chisel or axe, make a deep cut into the sapwood at regular intervals around the base of the tree, taking care not to ring-bark the plant. Immediately saturate each cut with undiluted Tordon Brushkiller.
  5. Injection method: As each hole is drilled saturate it with undiluted Tordon Brushkiller using a sheep drench pack with a spraygun.
  6. Sites with appropriate tall forest species present can usually be left to be overtopped. This can also be sped-up by selective slashing, stump swabbing or planting.

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