PH PERFECT® CONNOISSEUR COCO BLOOM (PART B) Experts Only: An Ultra-Premium 2-Part Bloom-Phase Base Nutrient Uniquely Formulated for Experienced Coco Coir Growers! Only expert coco coir growers need apply. When it comes to getting the bigger yields you want, the bloom phase is a critical time to get it right. Now you can get ready for your best harvests to date using Advanced Nutrients’ pH Perfect® Connoisseur Coco Bloom.