Empathy AfterPlant Rose Food with rootgrow 5kg

There is no information regarding the dosage of this product even on the manufacturer's website so if anyone wants to know: 1 to 2 handfuls (25-50g) per rose bush in the Spring and again after the first flush of flowers. In fact, the is no information to say whether it is applied as a liquid feed or a top-dressing: these are granules for top-dressing.I have used "Toprose" for years with good results but having had excellent results with "Rootgrow" mycorrhizal fungi when planting bare-root roses, I thought I would try this product. I have 40 rose bushes so 5Kg is enough for a whole growing season. This product works out much more expensive than Toprose (roughly 4 times as expensive according to my calculations based on cost per plant per season). It remains to be seen whether this extra cost is justified.