Yellow leaves on your potted Houston bougainvilleas = drainage issues. Even with drain holes, pots on flat ground let roots grow into soil, then tear when lifted.
Read Gordon Braswell’s "Bougainvillea Information" (retired nursery specialist). Covers containers, soil, bloom cycles, climate. Your yellowing is almost certainly wet feet.
Fix drainage, elevate pots, and follow Braswell. Blooms will return.
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