Environmental weeds are plants that invade indigenous ecosystems. They seed profusely and establish into the indigenous landscape very easily. They are not necessarily introduced species, they are often natives but not natives indigenous to the EVC that is present in that particular ecosystem. They are brought in by animals, humans, wind and rain.
So why are they a problem?
because they seed so profusely and establish so easily they often outcompete indigenous seedlings trying to establish. This affects not only the appearance of the area but also its ecosystem because the indigenous plants that indigenous creatures need for shelter, food and nesting are no longer available. If left uncontrolled they will, in most cases, destroy ecosystems.
We have a number of Environmental weeds on our hit list at the Jock Marshall Reserve. Due to the many ways these weeds enter the reserve, it is almost impossible to eradicate them. Some have even grown into large trees and it is not feasible to remove them at that mature stage. The best we can do is control them and keep their numbers to a minimum. We remove the seedlings and small plants as they pop up to ensure they cannot establish themselves and mature. We also plant as many indigenous plants as we can so there isn't space for these environmental weeds to grow.
Some of the Environmental weeds we look out for include;
Native passionfruit - Passiflora herbertiana
Sweet pittosporum - Pittosporum undulatum
Common ivy - Hedera helix
Mirror bush - Coprosma repens
Brush box - Lophostemon confertus