How come my bulbs don always flower at the same time or even the same height as a catalogue says?
The growing region and temperature treatments all affect flowering characteristics. A variety from Holland will normally flower one to two weeks later than the same variety from Skagit Valley. Just as important, though, is where you plant your bulbs. For example, tulips from the same batch may flower two weeks later and be six to eight inches taller when planted in full shade as opposed to full sun. The color may also vary slightly.
