Regarding the moving & gardening bit, I totally agree with banning it from any garden-heavy event.
Just as a side note, the plants may never die or get weeds, but you also cannot fertilize them for more better yield.
I would imagine one would just plant perfect plants, then.
It'd be worth it, for sure.
Definitely worth it.
I got to thinking about this challenge, and I think that this challenge should not be taken as heavily as some other challenges such as the Perfectly Happy challenge. While there is always some luck involved, as it has been proven (in this thread I believe) that there is a huge amount of luck based on the amount the nectar made is worth, as well as what machine you're running on and given the fact that not every game will give out the same results.
For example, in the Perfectly Happy Challenge, there is virtually no luck involved in getting the Perfect seeds, aside from the fact that you may find a great, outstanding, nice, normal, bad, etc. quality seed, but that can be fixed with the Green Thumb trait, Super Green Thumb reward, and Garlic or life fruit at perfect quality. For nectar however, no two bottles will be worth the exact same no matter how hard you try to keep things constant. Sorrying for my little rant on it, I still want to participate, I just want people to know that no matter how good your recipe is, it may be better for someone else 100% of the time just because of their CPU.