Collecting plant samples for identification

Damien O’Sullivan
Department of Agriculture and Fisheries

Plants are important indicators of the health and condition of your pasture. Recognising key plant species and understanding their role in your pastures is a vital step in monitoring pasture health. A good knowledge of pasture species also helps you to quickly notice potential weeds. It is always good practice to get a new or strange plant identified to reduce the risk of weeds becoming established on your property. Plant identification books can generally help identify most species, but for the tricky ones you can take a sample to an expert. Where to get help with identification will vary between Queensland, the Northern Territory and Western Australia.

Queensland

  • Your local council weeds officer can help identify most declared weeds
  • Alternatively you could take a sample to your nearest DNRM or DAF office.

Northern Territory

  • Your local Weed Management Branch of the Department of Land Resource Management
  • Your local DPIR Pastoral Production office
  • For harder to identify species, try the herbarium in Alice Springs or Darwin.

Western Australia

How a plant is collected, preserved and presented will affect how easily, quickly and accurately it can be identified. The following points are a guide to plant collection:

  • Collect as much of the plant as possible including roots, flowers and seed pods.
  • Make a note of the plant’s growth habit, height, size and any particular characteristics. Was it sticky or prickly to touch, erect or prostrate.
  • Make a note of the growing conditions including soil type, slope and aspect, and whether the plant occurs in native or sown pasture or in cleared country or uncleared bush.
  • Putting the plant in a plastic bag will help to keep the sample fresh, but it will also promote mould. If it will be more than a couple of hours before you can get the plant identified, put the sample in the fridge to reduce the chance of mould growth.
  • If it is more than two days before you can get the plant identified the plant sample will need to be dried. Spread out the sample and put it between sheets of newspaper, then place a weight such as some large text books on top. The paper will need to be changed every second day until the plant has dried and there is no risk of mould forming.
  • A digital photo can help with quick identification of some plants. When taking photos of plants take one of the plant where it is growing. Then spread the plant out on a sheet of white paper in a well lit but not sunny area and take photos of the leaves, the seed heads, the stems, and the flowers. These can then be emailed for identification.

Plant identification publications should be available at your local council office, your nearest DNRM, or DAF office, and your regional natural resource management group.

Useful web links

Useful publications