I have no idea what this is but it is extremely healthy and hardy...
ahntjudy Your different plant appears to be Ambrosia artemisiifolia, AKA common ragweed. Often mistaken for a marigold, the weed is often nurtured for months by an innocent gardener who wonders why it won't flower (don't ask me how I know this ).
Well, the link is for New York. Google one for your area of Texas. I used key words New York Weeds. Texas weeds might be too broad. Maybe Texas Oak-Prairie (southern Post Oak Savannah and Coastal Prairies ecoregions) weeds. Something like that. Just don't go onto herbicide company sites. Noticed they tend to list only ones their products can eliminate.
Abigail, all 9 kids grown and 23 little gardeners.