So here's some constructive feedback after now played A LOT with the gecko mechanic.
THEYS GOTS TO GO! Of all the resource variants the geckos are the worst. Not that they bad idea or I don't like them personally or anything but they are TERRIBLE for long lasting servers. Strictly Unprofessional Public has had a lot of 1000+ day servers lately and we are constantly running into the same problem around 500 days-ish, there is no more grass in the world.
Many players still keep the old mindset of plant it and forget it when creating resource farms and this causes MANY problems because they ignore disease and more importantly geckos. There are a lot who want the geckos but given enough time most of the geckos die off. And when the geckos die off they are not replaced with a new grass plant so the longer servers go the less and less grass we end up with. This really sucks on long lasting public servers as well because it makes it harder for players who join so late in a world's age and they spawn in with NOTHING, no hope of finding grass. Then it becomes the rest of the players on the server responsibility to provide every new spawner with a simple, and what should be a plentiful resource, such as grass.
I like the idea of the resource variants and twiggy trees and petrified forests are working out GREAT but the geckos are ending up hurting worlds rather than helping or making them fun and evolving. Just my input, hope it helps!