Sure, if each variety can be prsent in "my" list only once, I would list several rows in the comment field, one row for each batch.
The comment field could also work for "how eager am I to give these away" ... but iot would not be searchable. If there were a slider or radio button for "availability", a person could search for "all", or only for "freely available". That would also be a way to filter out "not for trade" or "I'm out of these until next Fall".
Now that I think about, there could be a category for "I will have cuttings available in the proper season, just not now".
