Calathea light requirements photosynthesis
Quick answer
For Calathea, light requirements photosynthesis come down to this: Calathea species (insignis, makoyana) are obligate shade plants with low light saturation points (600 μmol photons·m-2·s-1). Dark-green leaf sectors contain higher chlorophyll a/b, carotenoids, anthocyanins, and flavonoids than light-green sectors, creating differential photosynthetic capacity across variegated leaves. Excessive light causes photoinhibition and irreversible PSII damage below Fv/Fm 0.4.
Start here:
- 1. Position in locations receiving 100-600 μmol·m-2·s-1 photosynthetic photon flux density
- 2. Use sheer curtains to diffuse direct sun exposure
What light requirements photosynthesis mean for Calathea
Goeppertia spp.
Calathea species (insignis, makoyana) are obligate shade plants with low light saturation points (600 μmol photons·m-2·s-1). Dark-green leaf sectors contain higher chlorophyll a/b, carotenoids, anthocyanins, and flavonoids than light-green sectors, creating differential photosynthetic capacity across variegated leaves. Excessive light causes photoinhibition and irreversible PSII damage below Fv/Fm 0.4.
How to meet Calathea light requirements photosynthesis
- 1
Position in locations receiving 100-600 μmol·m-2·s-1 photosynthetic photon flux density
- 2
Use sheer curtains to diffuse direct sun exposure
- 3
Monitor leaves for chlorosis or necrosis indicating light stress
- 4
Relocate immediately if leaves show bleaching or brown patches from photoinhibition
Keeping Calathea in range
Provide bright indirect light only (east or north-facing windows). Avoid direct sunlight which overwhelms the low light saturation point and causes permanent photoinhibition.