How to feed gooseberries if planted through mypex??

I'm planning on planting a new gooser bed and was going to do it through mypex. I'm going to add manure and lots of other goodies to the soil before I plant the goosers themselves (awaiting delivery of the bushes) but then it occurred to me.......
How do I mulch / feed the bushes when they have been planted through the mypex as I won't be able to get to them very easily.