Answer: Mexican petunia is botanically Ruella and will become large and leggy if not pruned back. They flower most when the weather is hot so you might want to wait until things cool down a bit before pruning your plant back. Ruella tends to colonize an area and the best way to propagate your plant is not through cuttings but by dividing the the clump with a shovel. Even a single stalk with roots attached will become a brand new plant when divided from the parent plant.
Best wishes with your Mexican petunia!
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