In this posting, I wish to share some experiences of growing miniature rose under shaded light.
I purchased this miniature rose in beginning Dec 2008 and placed it at my window sill since then.
As I have mentioned in 'Photosynthesis - How many hours of sunlight does your rose need? ' posting, that a rose plant would require a minimum of 160,000 lux hours of light to survive.
Assuming indirect sunlight produces about 30,000 lux (light intensity) in an hour, easily this rose will get about 270,000 lux hours each day (about 9 hours indirect light per day), which is sufficient to fuel growth.
New flower bulbs started to emerge after about a month since I last pruned off the spent flower. However this time, the size of bloom is noticeably smaller and the new leaves texture is lighter than the earliers ones. I believe if the fertilizing is enhanced, the bloom quality may improve.
Though it may not produce the same bloom size when it was grown at more direct sun light, the important thing to note is there is no ill effect or any serious detrimental effect when its grown under shaded light. Despite lacking direct sunlight for more than a month, the bush looks healthy.
And to add on, this miniature rose was never been treated with any insecticide nor pesticide. This goes to show that miniature rose can aclimitised with minimal human intervention and without chemicals. Based on this observation, I can safely conclude that roses have the capability to adapt to its surroundings. The only difference is that the quality of bloom shall varied due to different environment conditions. The important point to note is that growing miniature rose under shaded light do not cause any detrimental effect.
At this point of time, I am inclining to the idea that miniature rose can be grown under shaded light.
Some questions to be considered as these findings are pursued further ...
1. Why are the blooms noticeably smaller? Was it caused purely by lack of direct sunlight?
2. Or the fertilizing dosage was weak therefore contributed to smaller bloom development?
3. Or perhaps both?
In my next prune, I shall increase the fertilizing dosage and examine the size of next bloom in February.