Re: gnomes, no effect on growth rate
In my experiments with Dandelions before the new status bars were added, seedlings with gnomes reached the level of young plant in 12 hours whereas those without gnomes took 16 hours. For that level, it seems to be roughly a 4:3 hour ratio between those with gnomes and those without.
For the later stages, unfortunately, I wasn't able to get accurate data due to test realm shenanigans. The gnomes definitely have an effect, though, and I'm going to try stacking different likes and dislikes when I am able to plant more varieties.
“Don’t ask what the world needs. Ask what makes you come alive, and go do it. Because what the world needs is people who have come alive.” ~Howard Thurman