Your new Cymbidium (Sacramento, indoors, indirect light, weekly water) developed yellow spots on petals, then all flowers on one spike browned and fell in two weeks; the second spike is following. New growths appear at base. You ask about the spots, spike removal, and rebloom timing.
Cymbidium flowers last 4 weeks to 2+ months. Yellow spots aren't typical of normal aging (usually just wilt/brown). Could be a variety trait or minor issue. Not enough info for definite diagnosis.
Once flowers drop, cut spikes at base—they won't rebloom.
Sacramento summers are hot. Move Cymbidium outside with midday shade. Water 2x/week (daily near 100°F). New growths are likely pseudobulbs, not spikes—they'll mature by fall and spike next winter.
Sacramento Cymbidium Society meets 4th Wednesdays (Oct–Jun, except Dec), 7 PM, Shepard Garden & Art Center. Great for hands-on learning.
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