What is 'trade name'? Is it like a major grower's series' lines? For instance: a major European company offers 8 Ranunculus cultivars, each color is prefixed by the series name (Safari), then the name (in this example, the color.follows.
Result looks like Ranunculus 'Safari Gold', Ranunculus 'Safari Rose', Ranunculus 'Safari Yellow'...
Is trade name like same as series name (Safari) ?

http://en.wikipedia.org/wiki/C... It is a long description but see if this helps.

The Cultivar name is what the plant is first registered under , And the Trade name is a nicer name for marketing.
EXAMPLE - Cultivar Heuchera Tnheu 043 = Trade name Heuchera Dolce Peach Melba
Cultivar Echinacea Emily Saul = Echinacea After Midnight

To add to that, the Trade Name is almost always trademarked.

The thread where we discussed this at length and ultimately added the field to the DB was here:

The thread "Trade Name is not a cultivar name." in Plant Database forum