Sambucus black lace

Looking for advice on pruning sambucus black lace. As you will see from two photos one is established and tall but losing its leaves while the other more compact and looking healthier. Should I prune the taller and make it more compact and if so when ? Do they need regular feeding
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The older one ,I'd cut back to roughly the level of the top of the little wall, maybe further down with some of the smaller stems.
The smaller one, I'd cut the whole thing down to about 12" / 30cm .
Do both in early Spring.
Thanks for response much appreciated . Peter
As for feeding, as for feeding I normally hoe in a few handfuls of Growmore around the base and then give them a good 2" multch of garden compost in early summer. They are really a low maintenance shrub once they are establish and require a prune after flowering. If its getting big or more folliage on top then prune back to about 2 ft
A A Milne