How much sunlight do poinsettias need each day?

Answer 1

there are over 2000 species so unless the variety in known, it is difficult to answer the question. They are adapted to a wide range of habitats, generally, well drained light soil in full sun, moist humus rich soil in light dappled shade or permanently moist soil in full sun

Answer 2

Eight (8) to ten (10) hours is the amount of sunlight that poinsettias (Euphorbia pulcherrima) need on a daily basis.

Specifically, poinsettias are short day/long night plants. They therefore need to be located where there are more hours of semi-darkness and darkness than of daylight in any twenty-four (24) hour period. The amount of darkness nevertheless needs to be monitored since the flowering process may be initiated any time the plant is exposed to 12 hours 20 minutes of uninterrupted darkness for five (5) days straight ... if other conditions subsequently are met.

But more important than the daily amount of light is its quality. Poinsettias need high intensity light that is not diminished by an overcast sky or heavy shade. At the same time, they need to receive that light from a protective position of light shade.