i dont understand the premise..

you should use a seed starting media for starting seeds ...

and a more general use media for long term pot use..

i prefer promix bx ...

https://duckduckgo.com/?q=promix+bx+home+depot&t=newext&iax=images&ia=images

i might also add mini chunks to the mix.. depending on what the plants are.. e.g. hosta and trees would like the courses drainage ...

and i would never use such with moisture pellets.. but that is your choice to learn how to use it if you wish .. but do understand they wear out.. as does the media.. and you should be changing out the media in long term pots every second or third year..

we would need a lot more info to diagnose why yours are failing... what kind of roses are you growing in pots.. and why ....

the general consensus in the gardening forums is that you can do a lot better than MG ...

ken

ps: just to clarify.. are you growing roses from seeds????

Ken

Actually my roses are small potted bands maybe 4 or 5 inches . Thats why I thought the seed potting would work .

As ken noted, seed starting mix is only suitable for starting seeds. Period. It is too finely textured and offers nothing to plants beyond the germinated seedling stage other than anchorage.

If you intended on long term container growth for your roses, then I would encourage you to visit the Container Gardening forum and review the countless discussions on this topic. Miracle Gro enters the discussion only as a brand name to be avoided.....as are most other commercial prepackaged potting soils. Most are heavily peat based and just do not hold up well and collapse and compact over time and become excessively water retentive. I'd encourage you to read and study the long running thread there on Container Soils and Water Movement. It's a long read but a fount of information and so worth it. You will learn that a bark based media is probably your best bet. And fertilizing is key. No potting soil has the nutrients plants need in active growth so must be supplemented by the grower regularly. If you water frequently in summer, you should be fertilizing once a week at half strength. While most container gardeners prefer Dyna Gro products, Miracle Gro fertilizer will work perfectly well.

Also, you can safely ignore any comments that roses somehow require specialized soil or fertilization. They don't.