Set some candles around the plant
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From: Your green lodger
Although the plant plainly doesn't need sunlight, lighting its room might encourage growth.
Unlocked with 200 x Foxfire Candle Stub
Losing your parlour
You arrange the candles around its room. When did your parlour become the plant's room? Never mind. Your plant turns its leaves towards the candles. It seems to like them. That's good, isn't it? Surely nothing distressing can come of all this?