Garden weeds - Principles of Horticulture - page 224

(b)

(a)

Figure 17.23 (a) Hypnum moss in turf; (b) pot
plant with Hypnum moss and Pellia liverwort; (c)
Polytrichum moss that may be serious in turf

species in the Pellia genus that are recognized by their
thick, flat leaves growing on the surface of pot plant
compost (Figure 17.23). These organisms increase
only when the soil and compost surface is excessively
wet, or when nutrients are so low as to limit plant
growth. Products containing pelargonic acid are
effective against these weeds on pot plants that have
woody stems (but not pot plants with green, non-
woody stems as they may be killed by this chemical).

(c)

Blamey, M., Fitter, R. and Fitter, A. (2013) Wild
Flowers of Britain and Ireland . Bloomsbury.
Hessayon, D.G. (2009) Pest and Weed Expert .
Transworld Publishers.
RHS (2013) Weed killers for home gardeners.
Online: www.rhs.org.uk/media/pdfs/advice/
WeedkillersForGardeners. RHS Advisory Service.
Thompson, K. (2009) The Book of Weeds . Dorling
Kindersley.

Further reading

British Crop Protection Council (2014) UK Pesticide
Guide . BCPC.
Brown, L.V. (2008) Applied Principles of Horticulture .
3rd edn. Butterworth Heinemann.

Please visit the companion website for further information:
www.routledge.com/cw/adams