Focus on Floriculture Vol 7 #3-4
Plants in growing media supplemented with ferrous sulfate at or below pH 6.5 were less severely chlorotic and, with adequate fertilization, grew more than plants in unsupplemented media. Chlorosis was evident at pH 6.2 and higher. Chlorosis is commonly observed in Tolmiea menziesii. Piggy Back Plant. The cause is assumed to be higher than optimum pH, although low fertility level has also been suggested as contributing to the problem. Rooted plantlets were transplanted into 10cm clay pots, January 17, 1979, with a 1 part silt loam: 2 parts peatmoss: 2 parts perlite grow ing medium modified to optimum nutrient levels (1 ) and pH 6.5. Additives of ferrous sulfate (0, 0.53 and 1.1 gm/pot equivalent to 0, 1.5, and 3 lb/ cu yd), and slow release fertilizer (0 and 1.76 gm 14-14-14 Osmocote/pot equivalent to 0 and 5 Ib/cu yd) were incorporated into the growing medium. There were 6 replications in a treatment.
Source: • Focus on Floriculture, Vol. 7 No. 3-4
Keywords: Peatmoss Tolmiea menziesii Rooted Optimum pH Ferrous sulfate fertility levels Hydrangea macrophylla