The irises also caught my eye! You know how to create lovely beds.
Also, I wanted to say that I've never seen a coleus look as neat as the one you have shown! It's so even!
1670 is a long time for nutrient depletion! The damage I fixed was only from a few decades! Either way, it's remarkable how fast the soil can recover, given the right conditions. I had a friend who gave up on her clay soil rather easily after "trying" to amend it. I feel like she didn't try for very long..