Plants look healthy but their height has not increased in over 20 days

A customer has a question and I hope we can get some opinions on it, thank

Our beautiful little plants, grown outdoors in pots here in mexico, look healthy but their height has not increased in over 20 days. They are currently in the vegetative stage, planted 12 weeks ago. They are bushy and healthy, just not getting tall.
Is this normal?

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Good morning! What strain are you growing? Is it and auto? Pictures help a ton!!

if the plants are a pure indica,…and around 18" tall…they may have reached their full height potential for the strain.

strains are not all the same,…some will grow very tall while others will stay very short… as long as the plants are healthy I wouldnt stress over it too much