Sun Sun Sun I even say it to my neighbors I often see many nice growing roses planted in a spot where the sun just isnt enough ALL roses need at least 6 hours eight is better and even more is ideal. Early day sun is better than mid day - late day sun but in a nut shell the more sun you give a rose the better
As mentioned Epsom Salt is a help but if you already have Magnesium in your soil adding it wont help or hurt try finding a new site that provides at least 7 - 8 hours of sun and prep that area for transplanting your non flowering rose utilize a fertilizer that has N-P-H of a 1-2-1 balance Example 5-10-5 and feed the soil once a month during the growing season and READ the label for proper use when it comes to ferts. Over feeding can be harmfull and yes go orgainc Mulch and water on a routine schedule.
Dig a little 2 or 3-inch deep trench around your rose bushes & add Epsom salts--cover salts back up with soil & keep watered. Rose bushes take a LOT of water in order to keep blooming. Unfortunately, most won't bloom once the weather gets too hot--but keep watering anyway.
Please stay away from Miracle Gro, Ortho and all those leaf-growth enhancers. You need bone meal, good compost and some Epsom salt. Mine bloom like maniacs and that is all I use! And to control aphids and pests, a simple diluted solution of 10% Murphy's Oil (vegetable based soap) will suffocate them and allow your flowers to bloom. Good luck.
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