The Rose Fertilization ultimately come down to what you desire from your roses. The fundamental variation between synthetic fertilizers and those which are organic is synthetics feed the plant while organics feed the soil which in twist feeds the plant. Knowing this and meaningful what you want from your roses determines which way you desire to proceed.
In soluble nitrates, Synthetic fertilizers are high - the nitrogen form used and directly by the plant. Using these fertilizers, it will make an immediate uptake of this nitrogen, therefore creating a burst of fast growth, and producing a plethora of plant-sucking rose pests similar to aphids which are attracted to this nitrogen & tender new growth. The advantage to use soluble nitrates as Rose Fertilization is that you can manage when you want your roses to bloom, how long you desire the stems to grow, and a host of other things that are of profit to the rosarian who wants to show his or her roses at a specified time.
I realized that lilies and sweet peas were leaving to be relatively easy to grow. Lilies were specially hardy, just plunk them into the ground and they would do well. Sweet peas might be planted in early spring (zone 8) and they would grow in a matter of weeks. And roses digging a hole and putting them in was simple enough.
What more would they need?
On the down side, it need you to apply more pesticides to control the onslaught of pest insects, it makes excessive growth at times when the freezing temperatures may cause die-back, it leaves unwanted salts in the soil, the rose’s life is shorten, and it bypasses The Nitrogen Cycle - the method Nature intended to fertilize plants - thus sinking microbial activity in the soil which is eventually detrimental to the garden like a whole.
It’s for these drawbacks that I no longer utilize synthetic fertilizers in my Rose Fertilization program, although I did for approximately twenty five years before I learned my lessons. Many of the roses I produce have been found thriving at abandoned serious yards and home sites with no supplemental fertilization of any kind. Thus, I wish to blend organic materials essential to sustain rose growth over a period of years. This blend is adapted for my garden, and it may not be what is required in yours or others. I identify this blend is good for my garden because I achieve regular soil tests - something I highly suggest before you buy or blend your own Rose Fertilizer.