Temperature 16 - 18ºC day initially, 15ºC night dropping to 10ºC minimum night
pH 5.8 - 6.5
Feeding Balanced fertiliser at 200 ppm Nitrogen as needed. Plants are sensitive
to high EC concentration levels.
Common diseases Antirrhinum Rust is a serious disease – dark brown spots on underside
of leaves. Severely affected leaves shrivel and die. A fungicide spray
program is needed.
Pythium - rotting roots and chlorotic plants at any stage.
Rhizoctonia - basal stem rot, red/brown in colour generally at seedling
Botrytis - Grey Mould attacks damaged plants in high humidity poor
Other diseases to look out for are Downy Mildew and Rust.
• The media should be allowed to dry regularly
between watering and never saturated.
• Avoid excessive water stress as this will cause
• Care must be taken to avoid damaging the root
system when pinching recently transplanted
Insects: Thrips, spider mites, aphids, fungus gnats
Diseases: Botrytis (gray mold), Thielaviopsis,
Pythium, Rhizoctonia, Downy Mildew, Powdery Mildew
Problem: Plant collapse
Causes: Plants grown in saturated media for extended
periods of time (Pythium, Thielaviopsis); Stem canker
(Botrytis); Rooted cuttings transplanted too deeply
Problem: Excessive vegetative growth and lack of
Causes: Excessive ammonium-based fertilizer; Overfertilization
under low light conditions; Low light and
over-watering, saturated media
Problem: Yellowing of young foliage
Causes: Fe deficiency/high soil pH; Saturated media
Problem: Foliage necrosis
Causes: High soluble salts in media; Excessive water
Problem: Poor branching and thin plants
Causes: Low fertilization during early stages of
growth; Low light conditions