Re: adjusting daylength (to flower horemanii)

For anyone who has experimented with artificial light to change daylength in
order to flower plants (as per discussion for E. horemanii), how important
is the annual cycle?

- When a short day (e.g. 8-hours) is needed for flowering, is a
complementary long day followed by transition periods needed?

- Or, can a short day immediately follow a 12-hour day?

- In either case, for how many weeks is the short day needed to trigger the

- And what about concomittant changes in temperature, light intensity, etc.

Neil Frank                 Aquatic Gardeners Association,  Raleigh NC