About Nancy Expertise I can answer questions on the following subjects:
Pests, chemicals
Showing AVs
Sowing Seeds
Problems with plants
Basics of AV growing
Episcias
Streptocarpus
Experience I am an African violet Advanced Judge in US and Canada. I have written a book on pests of African violets called "Insects, Pests and Diseases of the African Violet Family" My articles appear in African Violet Magazine and Chatter as well as in other magazines.
Organizations AVSA
AVSC
African Violet Society of Greater Montreal
Saintpaulia Society of Montreal
Publications Book author: "Insects, Pests and Diseases of the African Violet Family"
African Violet Magazine, many issues
Chatter Magazine Many issues
Horticulture
Other Magazines
Education/Credentials University of Indiana Master's work (Music)
Awards and Honors Jr. Queen of Show (Pixie Blue) AVSC Convention Montreal
Approximately 100 blue ribbons
25 or so Best of Class
Past/Present clients I sell mostly leaves on Ebay. I sell plants at convention shows and local shows.
Question I have 12 AVs, each a different variety. They have always bloomed prolifically, but about 6-8 weeks ago every one of them stopped blooming. I have always kept them near a north window with 150 watt bulbs on over them all day. I used to water them about once a week, which kept them moist at all times, but recently started letting them dry out quite a bit before watering/fertilizing.
Answer AVs must have sufficient light, water and fertilizer to bloom. It looks like you have been doing very well until just lately.
Remember if these plants have been in bloom for a long period they may be taking a short rest. Look for buds forming in among the leaves.
You might consider changing fertilizer. I change each two months to get the higher numbers working. For instance if I use 15-36-15 for two months, I might change back to 20-20-20, then go for another with different numbers.
Each fertilizer has different micronutrients and these should also be considered.
I suspect your plants are just taking a rest. Allow them to do so. Buy another plant for color and wait for your others to begin blooming.
Sounds like you have very good techniques for raising AVs.
