Cameron, I'd be a little careful about adding too much uncomposted organic material at once, expecially when the plant is growing actively. As the stuff decomposes, it uses some of the nitrogen from the surrounding soil, and could rob that essential element from the plant when it needs it most.
In winter when the plant is essentially dormant it doesn't matter so much.
Well decomposed compost is a great soil conditioner and adds a little nutrient value, but it's not a substitute for fertilizer.
