Hydrocotle
Hydrocotyle ( including H.americana, H. heteromeria, H. novae-zeelandiae, H.mochata) is also known as Pennywort.
Problem Overview
Hydrocotyle (including H.americana, H. heteromeria, H. novae-zeelandiae, H.mochata) is also known as Pennywort. It is a common perennial that grows vigorously via a network of stolons. It has small heavily serrated circular shaped leaves that are light green in colour. It forms a dense mat which suppresses the growth of desirable turf species. It has a distinctive odour when crushed that resembles cat’s urine.
It prefers moist, shady areas but will survive well in full sunshine. Some people even use it as the primary composition of their lawn however, it is not durable under heavy or constant wear situations.
Solutions
All temperate species: Whilst most normal broadleaf weeds will burn the leaf of Hydrocotyle they will not provide long term control as the plants will recover rapidly. Herbicides containing Triclopyr & Picloram (eg; Triumph Gold, Victory Gold, Brushkiller) will provide good control. However, these products should only be applied to fine turf species from spring through until mid-autumn when the grass plants are actively growing.
Likewise these products should not be applied in hot dry conditions when the plants are under heat stress or moisture stress.
NOTE; Products containing Triclpyr or Picloram should not be applied to warm season grasses such as Kikuyu or couchgrass.
Other Similar Lawn Problems
Couch grass
Couchgrass (Cynodon dactylon) is a warm season creeping grass that is sometimes referred to as twitch or Indian doab.
White Clover
White Clover (Trifolium repens) is a native of Europe and is common in pastures, roadsides, wasteland and lawns throughout New Zealand.
Hawksbeard
Many lawns become yellow over summer due to mass of yellow flowers appearing from weeds commonly referred to as dandelions.
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