In the dark, in air with no CO2, and no water.
Weathering
Conditions necessary for photosynthesis include light, carbon dioxide, and water. The bacteria necessary for photosynthesis are cyanobacteria, which are capable of carrying out photosynthesis due to the presence of chlorophyll.
The process by which green plants prepare there own food is called photosynthesis.
Sunlight and CO2.
There are a variety of conditions which are adverse to photosynthesis, such as dim lighting, lack of water, etc. In adverse conditions, photosynthesis is either slowed down or ceases entirely. But to the extent that photosynthesis may continue to take place, it happens in the usual way; there is just less of it.
The five essential conditions needed for photosynthesis to take place are sunlight, carbon dioxide, water, chlorophyll, and enzymes. Without any of these conditions, photosynthesis cannot occur effectively.
photosynthesis
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Two conditions necessary for photosynthesis are sunlight - to provide the energy needed for the process, and chlorophyll - a pigment that captures light energy for use in photosynthesis.
Photosynthesis in plants occurs at a rate of about 0.5 to 3 grams of glucose per square meter per hour under optimal conditions.
for photosynthesis to work plants need a suitable tempreture range , available water , carbon dioxide and sunlight
Yes astroturf can freeze but only in the worst conditions :)