Most of the time you can apply products like Grow More 8-10-8 Magnum Grow Rose Food and Talstar P together and apply them at the same time so long as all the product labels of the items you are using allow tank mixing. While it shouldn't harm the roses to do this, and many companies will apply multiple products together when treating lawns, separating the sprays even by a little can be easier on the plants’ health. The Grow More does give instructions for either a soil or foliar application.
