Yes, I also only had time for one set of four seeds. It's very frustrating, especially considering how many variants there are. I had been hoping to get a few more of the newer variants, but I'm guessing that isn't likely to happen.
For newcomers, the problem is far worse. We have nine variants, and only if someone had timed it very tightly would they have had a chance to get more than four seeds total. Even if someone had a chance to get two sets of seeds, at the most they could get eight mushrooms, and they certainly wouldn't have had a chance to get any of the bred-only variants.
The admins have commented that the focus of this game is trading, so people can get all the variants that way. That's a nice concept, but if you keep a flower type rare, people are going to be far more inclined to hoard those plants rather than to either gift or trade them.