"The first few days of my kitchen redo, I cleaned up after the guys left (even though they did their version of daily cleanup and had the area enclosed in plastic). Pretty soon I realized that was futile and a waste of my time" Maybe you are using this as a figure of speech, but cleaning up after contractors even if it's a daily thing and they are going to get the same things dirty the next day, shouldn't be considered a "waste of your time". It's your house and your investment and you have to protect your own investment. Yes, even though you are paying someone to clean up. Why? Because some things that happen are probably more than just cumulative. A bit of crumbled drywall or a loose nail that gets caught around the edges of something protecting the floor will get ground into the floor if left there for a week. Small bits of grout left behind on the bathtub or shower drain will inevitably be stepped on and scratch the tub. Sawdust underneath the cabinets is going to be left there and covered up with the toe kick. Even it it's been vacuumed with a shop vac unless you get under there and clean it, a fair amount will be left behind. Your cleaning crew is not coming to the end of the project by which point it will be covered. The project manager for the last big project I did (who I did not like) left a paper coffee cup on the mantle and after sitting there for over a week it etched a ring in the 170 old fireplace surround. I didn't pick it up because I didn't like her, I was waiting to see if she would ever notice it, (obviously not) and when I finally threw it away myself, that's when I saw that it had eaten into the marble. I could be all p1ssed off at her (which I was), I could have thrown a big fit, I could have even posted a thread about it. but ultimately I had seen it there myself and was being passive aggressive about it and ultimately ruined my own fireplace by neglecting something I saw. Even though my contractor cleans up, he is still wearing dirty clothes, and he himself is not clean at the end of the day, so I don't feel that his "clean" is quite as clean as things should be. So it gets cleaned after he cleans. Yes, every time he is onsite and even though he will make a mess the next day. I don't consider this a waste of my time, and I have a full-time job, and work some evenings and have paperwork to do at home too. I don't consider myself too important or too busy to protect my own investment.

It looks like a metal door that has pitted. We don't have enough information to guess at the reason for the corrosion.

Trout lily, Erythronium americanum.

Try posting this on the Conifers forum for some expert input. This is not a landscape design issue.