You can only have 1.
no you can't sell any sort of greenhouses, boxs, meadows, once you get them you havve them for good unless you delete them
There is no limit to the amount of horses you can have on howrse.
Rainbow Greenhouses's population is 150.
Rainbow Greenhouses was created in 1985.
Many scientists believe that the greenhouses gases have contributed to the climate change due to increased concentrations of the gases in the atmosphere courtesy of human activities such as deforestation, and through fossil fuels.
Howrse Helper is a Wiki-like 'fan site' for Howrse that is not located on the domain name howrse I've been to HH and it is NOT a part of howrse, but I reccomend it as it has many useful links and answers, and helped me a LOT with objectives.
Greenhouses have regular air (nitrogen and oxygen gases) inside.
You can buy a pass with 20% of your reserve as of your 50th day on Howrse.
Design ideas for a lean-to greenhouse can be viewed on eHow. They offer information on mini greenhouses, window lean-to greenhouses and carport lean-to greenhouses.
You can do many things.
you can have as many as you like
No one knows because they are all multiplying! but, approximately 200 is what i think.