Christmas Cactus

bright indirect light (3-6 feet from a south or west window, or right next to an east window. Under a grow light, 6-10 inches away works well) from an east- or west-facing window; avoid harsh direct sun (right in the window where sun actually hits the leaves. A strong grow light 4-6 inches away can substitute) which turns stems purplish-red and weakens the plant. During the 6-8 week bud-forcing period in fall, extended darkness (12-14 hours nightly) is needed, so even a brief flash of artificial light at night can disrupt blooming

Prefers 40-50% humidity; in its native habitat it absorbs moisture from air as an epiphyte. A pebble tray with water helps in dry homes, especially during the heating season. misting (note: misting does not actually raise humidity meaningfully. A pebble tray or humidifier is more effective) is acceptable if kept off the flowers

Loose, lightweight, fast-draining mix; commercial bromeliad or succulent mix works well. pH 5.5-6.5. This is an epiphyte, so dense or waterlogged soil is particularly harmful

Mushy stems and black bases signal overwatering and root rot; wrinkled, rubbery pads mean underwatering; bud drop is often caused by temperature fluctuations, cold drafts, or moving the plant once buds have set