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The Lawn Guide
Guildford Grass
Guildford Grass

How To Kill Guildford Grass

Guildford grass is identified by its long stems that are dark green in colour, skinny, circular and very tough. This weed is not a grass at all, but part of the Iris family. Guildford Grass will also form a beautiful pink flower. Its root system contains deep rooted corms that make pulling the weed sometimes difficult. Often when pulled, the corm may stay in the ground and will re-germinate another time.


Cultural Management Of Guildford Grass

Lawn mowing has no effect in controlling Guildford Grass, and when mowed it usually leaves an ugly slashed appearance, making it difficult to maintain a nice finish on our lawns.

Guildford Grass
Guildford Grass (Romulea rosea)

The best way to control Guildford Grass is directly after it becomes apparent that an infestation has occurred, and to remove the weed by hand, making sure that the underground corm is also removed. The use of a small digging instrument to aid in digging Guildford Grass out of the ground with the corm intact is a good idea, a kitchen knife or fork, or hand spade or other weeding hand tool may fill this purpose perfectly.


Herbicide Control For Guildford Grass

Herbicides to control Guildford Grass are not available to the general public. However, a licensed weed sprayer can obtain these products and spray the herbicide for you.


Severe Infestation - Other Controls

The only other way of controlling Guildford Grass is the use of a bobcat or dingo digger to completely remove the top several centimetres of soil form the affected area.

After removal, new soil can be laid down, followed by a new lawn or garden bed. A very drastic measure, of course, but it can often be suitable as an option in a minority of cases where extreme infestation has occurred.


Prevalent
May - September


Treatment Times
June - August


Also Known As
Onion weed, Onion grass


Botanical Name
Romulea rosea




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Lawn Fact:
A waxy coating on the grains of soil is responsible for the water repelling effect that is often seen in soils, resulting in poor lawn or plant health. In a similar manner to detergents, Wetting Agents will break down this waxy coating, allowing for easier water absorption and retention. Wetting Agents should be included as a normal part of the maintenance routine of every lawn and applied at least twice a year.
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