Zinnias do well in a well composted bed with lots of food, which can encourage larger flower heads. Could also be the seed.

I would get him to add another row of tile.

It is interesting. I will be on the lookout for E. aquaticum here. It is certainly less obvious and attractive than E. d.

I am replacing a large garden tub with a walk in shower in my master bath. I was thinking of using a combined shower head with a removable hand held inside like the Delta models, but my contractor suggested putting the shower head on one wall and a separate hand held on the other side, where I will probably have a bench. Any comments on the advantages of either? The shower will be about 5 ft long. I want to keep things fairly simple, no extra features.