Cactus seedlings cannot tolerate direct midday sun—even in temperate zones. Ideal: open area with morning/afternoon sun, shaded at midday. Acclimate gradually: start with 1 hour AM sun, increase slowly. Use trees or objects for dappled shade. Water regularly once germinated.
Color shifts (green to yellow/red-brown) are normal—seedlings look nothing like adults and change through stages. Color can also indicate sun stress. Seedlings are extremely tender; excess sun or water kills fast. Protect them fiercely in year one.
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