Recruit
A greenhouse is the newest power of the city you decided to recruit. You’re trying to recruit all the buildings in town and the greenhouse was the next on your list. It adds just a little bit of power to the town, but it's important nonetheless.
Imagine what you had to do to recruit this greenhouse. Imagine schmoozing with the previous greenhouse owners to recruit them to your cause and sell you the greenhouse.
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After you recruit the greenhouse, you recruit Bobo (ぼ) the clown to guard it for you. Bobo the clown has a terrifying amount of power so he’ll make an excellent guard for the greenhouse.
Recruit Bobo the clown. Look at him. He’s terrifying. Bobo will make for a great deterrent for entry to your greenhouse.