Your plant = Euphorbia lactea (crested or normal). "White Ghost" is a variegated cultivar; care identical.
Resource: Desert-Tropicals Euphorbia lactea page (linked).
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Repotting Large Cactus-Like Plants: Euphorbia vs. Cactus Care
Euphorbia lactea 'White Ghost' ID and Care: No Overwatering, Heat Sensitive
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