nothing until the bulbs have flowere,then dig it cairfully with a garden fork, avoiding damage were posable to roots of bushes, then you can dig up the bulbs and split them so that next spring you will have a better show. welcome to the site, I garden a communal garden ,and november I planted eight fruit trees and the nabours are looking forward to the fruit, so good look with it.

if the shrubs are well settled in and robust it would take more than planting bulbs etc to bother them infact digging over the soil over will help let water etc in as soil can get quite compacted over time.id say especialy if you feed in the spring you will do more good than harm.im sure cliffo would agree . welcome from me to bye for now.

do you mean all the soil? If they dont know where the perenials are then I would wait until april when the ground is warmer and you can see where plants are. often shrub roots run out as far as the foliage 'canopy' so you could dig to that sort of area but as said the bulbs run the risk of being disturbed.

I'd use a fork to loosen the soil bt again later in the spring.

welcome to GoY too.