I had some success in roses and tomatoes by using GA3 ( Giberellic Acid
derived) at 1-3ppm as a foliar spray.
Tomato plants at 6 week / about 50cm high / no flowers on the friday when
sprayed - 16 flowers by monday morning- first tomato sighted on wednesday.
roses flower excessively - does have a side effect - stop spraying and the
plant does not flower for a while.
10ppm sprays eventually confuse the plant making the plant vegetate for long
periods without flowering at all.
expensive stuff though - cotton growers use it in Australia - 1ppm usually
increases yields by 30% to 80%
hope this helps
Hydroponics and Organics
hydroponics at powerup.com.auhttp://www.powerup.com.au/~hydroponics
Nerang Hydroponic Centre
17 / 39 Lawrence Drive
NERANG QLD 4211