A Solanum, perhaps. Here is a link that might be useful: Solanum aviculare

I have a baby butterfly bush which will be planted on the other side of the house in the Fall, so the bees and such won't be in my way. lol. We have two huge pink crepe myrtle that are taller than the house. We have way too many wild sunflowers here. I'm sick of them. lol. Cosmos are definitely on my list! The other plants mentioned I've never heard of except Verbena. When I worked in a greenhouse years ago I remember planting many of their seeds. I'll look them up. Here's a picture of the Crepe Myrtle from last year, they're getting ready to bloom again.

I would search as much as you can. When you water these plants, are you watering the entire plant, or just the soil? In other words, are the leaves getting wet? If so, you have to look at mildew, mold, fungus as the culprits. Tomato pests/insects almost always hide on the undersides of leaves and many (aphids, whiteflies) are VERY small. Do you see anything unusual under the leaves of your tomato plants? Check out these links for pictures to see if these match what you are seeing: Flea Beetles Grey Leaf Spot Bacterial Speck Quoted from Bachman's: Whiteflies can be a horrible problem. Look for small white flying insects near the plants and what looks like rice on the bottom side of older leaves. Commercial growers in Florida have been successfully using horticultural oil sprays to smother the eggs and larvae. Slugs munch away at the almost ripe fruit, leaving ragged holes, ruining the tomatoes. Trap and/or repel them as you would with other plants. Quoted from Bachman's: Bacterial Speck or Spot produces specking and spotting of both the leaves and fruit. It appears as small raised specks or scabby-looking spots on the fruit, while the leaves may have specking or larger dark spots that lose their centers. If the disease occurs early in the season, the yield may be severely affected. Ripe fruit is unaffected.

are you talking about the lanceolate leave that looks like a crocus??? or the other leaf??? asking us to focus on the green leaf... doesnt quite indicate which you are asking about .. some might say.. at 12 o'clock from center.. rather than the one at 10 o'clock .... OMG ... H offered an enlargement of the pic when i hovered over it ... ken