Nursery bougainvilleas are tender hybrids. They hate root disturbance—planting in the ground shocks them.
Outdoor light is vastly more intense than indoor, even in "same" sun. The pigment shift (red → purple) is a direct response to higher UV and light intensity. Cooler nights can also alter color.
Unlike hibiscus, bougainvillea color isn't pH-dependent. Stability (pot, light, temp) is what keeps color true.
Accept the new color or replace with a landscape-grade variety for ground planting.
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