Bidomes not working?

[Lith7ium]

Hey guys, please help me out here. I'm currently in stage 4, raising the O2 in the atmosphere. I have built several Biodomes and they produced quite some lichen but the plant growth just doesn't happen. The temperature is about 11°C, water levels are at ~700 meters and with 300mBar CO2 there should be plenty for the plants.

The biodomes start out good but do not cover anything more than their initial area with plants, even after years.

I made a screenshot, but don't know how to attach it. You can find it here: https://steamcommunity.com/sharedfiles/filedetails/?id=2902628760

[Spud Dastardly]

Plant growth requires sufficient oxygen. You should see more plant growth once you get to 30-60 mbar

[Emmote]

Stuff tends to grow quicker around water too - rivers in particular.

[Mavrah]

Best to turn on the humidity overlay. That'll show you where the lichens and then plants will be able to spring up. The biodome only affects a small area until life starts to take, then it spreads on its own and you won't be able to help or hinder the evergreen plague. Demolish and replace with food buildings or extend the water network so you can seed another area.

[QSquared]

biomass follows humidity and will not jump over roads, which is kinda dumb (that roads block it) imho