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Mystery Monocot Shoot in Chico, CA: Amaryllis Relative or Humboldt Lily?

A gardener in Chico, CA, had a single reddish-purple stalk emerge overnight from a bulb the size of a small onion, 14 inches tall.

Unknown plant

Expert Analysis

Hard to ID from just a shoot. It's a monocot, likely a lily or amaryllis relative. UC Berkeley Botanical Garden has a similar Boophone blooming now. Late in the year for new growth. Humboldt lilies are common in CA and bloom late. The expert requested photos of the flower and leaves (expected flat, linear like large grass).

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