Forms and cultivars 1
Each form shows its light value and where it was measured: ● on this form itself, ○ on the form or species named in the line. Grades: A Measured directly, B Indirect, C Distant.
Green 1
Grew in trials at 20, saturates at 330 µmol/m²/s · measured on green Philodendron hederaceum C
Will my window do?
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On the Fenestry light scale
Very dim to some direct sun
Thaumatophyllum bipinnatifidum grew at about 1,100 lux; its leaves saturate at about 18,000 lux.
20 C and 330 µmol/m²/s C · Measured on Philodendron hederaceum (another genus)
What the studies tested
Results from growing trials, many of them in commercial greenhouses. They are not care instructions.
Care
Feeding
Seedlings fed weekly for 14 weeks in 15-cm pots grew about as well at 350 as at 700 ppm nitrogen; above 700 ppm fresh weight fell, and at 1,700 ppm growth was greatly reduced.
A Measured directlyMeasured on this species
Plants moved into 3–90 L containers graded higher the more Osmocote 18N-2.6P-9.8K they got (1.2–9.6 g per litre of container every 6 months), in every container size.
A Measured directlyMeasured on this species
Propagation
Seed covered at twice its diameter emerged at 80–91 % in five media; covered at four times its diameter it emerged more slowly and, in two of the media, at only 18–22 %.
B IndirectMeasured on this species