Ken Matsuo of Canadian Floriculture Ltd, Surrey, BC along with Yasir Syed of BioFert Manufacturing Inc discussing remedies for slow growth and bud size in rose grown under greenhouse.
Earth Boost, GreenUp and Special Blend of Rose and Flower Food was recommended to Ken to overcome slow growth in roses. The  fertilizer appplication made an obvious difference in leaf and bud size and vigour after 2 applications.
      
Photo 1                                                                Photo 2

 Leaf size increased 2-3 times and bud size was doubled at Canadian Floriculture (Photo 2) after treament with Earth Boost, GreenUp and a special blend of Rose and Flower Plant Food.  Note the smaller leaf size (view lower leaves in Photo 1) as compared to new growth (Photo 2) after application of BioFert specialized fertilizers for Floriculture.