Posted: 21/08/2015 at 09:07
Hi, Angela....I think we need to think where we are in the season. At this time of year it isn't usual to feed high nitrogen feed, which will promote new leaf growth that (because of their tenderness) may get damaged by winter frosts.
It would probably be preferable to feed 'Growmore', which is equally balanced in all three nutrients i.e nitrogen, phosphates & potash, followed by a mulch of garden compost or well rotted manure.
I note that 'Miracle Gro Shrub and Rose food' has an NPK rating 5-11-15, which being high in nitrogen & potash would make it an ideal spring feed.