This is a collection of info and tips on what we have observed while  addressing the annual pompom threat.


  • Can be obtained from
  • We recommend using Plenum
  • Plenum requires a wetting agent (called Actipron) and a dye (blue is best)
  • The Actipron and dye should be mixed with the herbicide on the day of use and should be used on the same day as the efficacy deteriorates once mixed
  • Plenum comes in 10 liter container only (and you will spend around R4 000 to get started when you buy from Ecoguard in the minimum quantities)

Notes for using herbicide:

  • Herbicide is toxic, and must be used with great care and while wearing protective gear
  • Herbicide may not be used in water courses, near boreholes, in wetlands
  • Herbicide should not applied in windy conditions
  • Herbicide is not effective when temperatures exceed 29C because of the plant’s protective mechanisms
  • Herbicide must rest on the plant for at least 2 hours to take effect

Best results are achieved when:

  • Work commences early summer when the plant is very small
  • Work is followed up at least once, but preferably three to five times during the season
  • When herbicide is applied BEFORE a flowerhead forms


  • It is an insufficient and wasteful effort to cut off the flowers
  • A cut flower stem on a growing plant WILL produce between 5 and 7 NEW buds
  • If the flower has opened (is fluffy) when the herbicide is applied, it is better to cut the flower off

Many land users delay treating the plants because they are waiting for the neighbours, the roads department, a change in circumstances, etc.  Delaying the treatment will make the situation worse.  The plants do not disappear – they are dormant in winter and flourish in the spring.  The seeds are very effective, and a few WILL be many next season.  Fire does not destroy the plant. Cutting it down stimulates growth.