2007-01-26 05:55:44 · 6 answers · asked by johnnie p 1 in Home & Garden ➔ Garden & Landscape
Ground Temperature, Length of Day Light, the calendar they got at the beginning of the new year
2007-01-26 06:08:11 · answer #1 · answered by mrjomorisin 4 · 0⤊ 0⤋
Mostly by temperature. That's why you see plants bloom when you get a warm spell when it would normally be cold.
2007-01-27 08:26:41 · answer #2 · answered by txpilot 3 · 0⤊ 0⤋
Length of daylight
2007-01-27 09:52:16 · answer #3 · answered by nursesr4evr 7 · 0⤊ 0⤋
1) length of day
2) angle and intensity of sun rays
3) temperature of air and soil
4) amount of humidity in the atmosphere
5) activity of certain micro-organisms in the soil
2007-01-26 14:11:44 · answer #4 · answered by mickey 5 · 3⤊ 0⤋
By the temp change, usually.
2007-01-26 14:04:10 · answer #5 · answered by scarfyrre 3 · 0⤊ 0⤋
cause they're smart
2007-01-30 02:47:09 · answer #6 · answered by C Shannon 3 · 0⤊ 0⤋