I don't see any signs of pests eclayne. I've been thinking of a virus or fungus...And hopefully these will be ready to go outside beginning of May when the risk of frost is over.
This is a photo of the garden as it is. Still a bit bare except for the lawn (we only started reshaping it a year ago; it was really a dump back then)
I'm planning to put them left of the little stairs against the retaining wall. They'll have full sun most of the day then