I was gratified to see that Mr Wiki thinks the same too ... quote "F1 hybrid. The offspring of distinctly different parental types produce a new, uniform variety with specific characteristics" with the emphasis here on UNIFORM.
So picture this, I bought some F1 hybrid butternut squash seed (Harrier) and grew 4 plants. I could see that there were two obviously different sets of plants as they were growing but now that I have harvested them it's even more obvious.
See for yourself, the ones on the left were the shape I was expecting (I've grown this variety before) but the ones on the right came from the same expensive seed packet as the left ones. Two plants produced regular shaped ones and the other two produced serpentine oddities.
What happened should have been impossible if they were truly F1 hybrid seeds, but the proof is there, which to my mind can only mean they were not in fact F1 hybrids at all, despite paying an arm and a leg for the seed.
So is it all a bit of a con ?
