Yes, Gardens Alive now owns the others. Not Monsanto . . . yet.
According to Garden Watchdog Gardens Alive owns:
Audubon Workshop
Breck's (Canada)
Breck's Bulbs
Gurney's Seed & Nursery
Henry Field's Seed & Nursery
Henry Field's Seed & Nursery Co. (Canada)
Michigan Bulb
mySEASONS Garden Solutions
New Holland Bulb Co.
Rockwood Gardens
Spring Garden Canada
Spring Hill Nursery (aka SpringHillNursery.com)
Thompson and Morgan (US)
Thompson and Morgan Canada