Calochortus roots

Kipp McMichael via pbs
Tue, 13 Oct 2020 08:43:31 PDT

  I have heard air pressure (specifically the swings to low pressure that come with the return of rainstorms) could be the signal.

  I tend to repot no later than Oct 1 because the bulbs start to wake after that. I have found that the new roots will only grow very, very slowly until soil moisture arrives and I have found new root buds as early as July.

From: pbs <> on behalf of Jim Barton via pbs <>
Sent: Tuesday, October 13, 2020 7:42 AM
To: <>
Cc: Jim Barton <>
Subject: [pbs] Calochortus roots

Last Saturday I dug up a pot of Calochortus vestae to repot them for this coming growing season. I was surprised to see that the largest bulbs were beginning to put out roots. They had been outside all summer with no water since the rains stooped last March. I have wandered how do they know it's time to break dormancy. Do they have an internal clock, is it temperature changes, daylight length (how that would work I don't know as they have 3 inches of soil over them?). Sunset zone 14.
Jim Barton

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