Cattleya Alliance Red Leaf Edges: Sun, Stress, or Natural Color?

Red Edges on Cattleya Hybrids

Unlike Phalaenopsis (where red edges often = too much light), Cattleya alliance plants (including Brassia, Miltonia, Oncidium hybrids) often show red/purple pigmentation naturally, especially with red/purple flowers. Your 'Momilani Rainbow' likely has this genetic trait.

Assessing the Other Symptoms

• Slightly wilted leaves: Could be from dry medium at repotting. Water thoroughly after repot; keep evenly moist during establishment.
• Dark velamen (root sheath): If roots are firm = probably just media dust or natural pigment. If mushy = rot (trim them).

Cattleya Alliance Light Needs

They want more light than Phalaenopsis—bright light with some direct morning sun. Leaves should be medium to light green. Dark green = too little light; yellow/bleached = too much.

Action Items

1. Check root firmness—trim only mushy ones.
2. Ensure medium was moist at repotting; water well after.
3. Provide bright light (east/west window, or slightly shaded south).
4. Weak fertilizer weekly during active growth.
5. Monitor new growth—healthy new pseudobulbs/leaves = success.