Hello and welcome to Dakka!
I hope you'll like it here.
As for your question, no, it's not free. You have to pay reinforcement points for it (if you're playing matched play, like most people are). Abilities that add models to existing units generally don't require reinforcement points, while those that ass new units do, unless stated otherwise. Horticulous' ability doesn't say it doesn't cost reinforcement points, therefore it does.
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