Three Things You Need to Do For Growing Mini Roses Successfully
They require a full 6-8 hours of hot sunshine a day!
Yes, they'll survive with a little less but like their larger cousins, they'll reduce their flowering for every little bit of light less than what they require.
I note in commercial rose production a reduction in light of 1% results in a flower production drop of 1%.
Feeding Mini Roses
I generally recommend a spring feeding with compost to get the soil activated and then at first flower bud start using an organic feed such as fish emulsion to provide them with a little “extra” to help with flower production.
I do not use chemical fertilizers as these tend to wipe out beneficial soil microorganisms that help the plants.
A common garden recipe in growing mini roses is to recommend 1 to 1.5 inches of water every week.
Put this on in two three-quarter inch applications spaced equally over the week. I have an inexpensive rain gauge in my garden to evaluate how much water the rain or sprinkler system puts on. It is probably one of the best $2. investments I've made in tools.
Growing Mini Roses
This means putting them in good soil.
Clay is fine for roses. As is an average garden soil.
What a rose will not grow well in is a sandy soil unless you really watch the watering and maintain water levels. Dry a rose out and flower production and growth plummets.
Perversely and conversely, a rose will not tolerate standing water for any length of time so this is not a good pond-side plant.
How to prune mini roses - an easy skill to learn and master.
Propagating miniature roses
Online Rose Shopping
A wide variety of rose plant resources from multiple suppliers - do not buy seeds (too good to be true category)
All of Doug's Ebooks including how to grow roses in tough climates