Emerald Harvest Cali Pro Bloom A, 6 gal

Part A of the Cali Pro 2-Part Bloom Base Nutrient, 6 Gal

Cali Pro Bloom A is one half of the flowering side of Emerald Harvest's 2-part Cali Pro base system, always diluted into the reservoir alongside an equal portion of Bloom B. Emerald Harvest splits the flowering formula across the two bottles because Bloom A's calcium content would react with the phosphate and sulfate salts carried in Bloom B if the two were concentrated together. Bloom A and Bloom B together supply the full flowering-phase profile: nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur, plus chelated iron, cobalt, manganese, and zinc. Bloom A specifically carries the calcium and a portion of the micronutrient load that would react poorly if concentrated alongside Bloom B's phosphate and sulfate salts.

The 6-gallon size fits a home or small commercial grower running the 2-part Cali Pro bloom formula through a regular flowering cycle.

Key Features & Benefits

• Part A of the Bloom pair — always mixed in equal portions with Cali Pro Bloom B during flowering.
• Carries calcium and part of the micronutrient load — kept separate from Bloom B to prevent precipitation reactions.
• Bloom-phase macronutrient ratio — phosphorus and potassium weighted for flowering and fruiting.
• Chelated iron, cobalt, manganese, and zinc — formulated to stay plant-available through the flowering feeding window.
• Straightforward 1:1 dosing — no per-stage math — equal parts Bloom A and Bloom B at every feeding.

Who Should Use Cali Pro Bloom A

Growers who'd rather run a 2-bottle flowering formula than manage the added mixing steps of the 3-part Grow, Micro, Bloom lineup are the target audience for Cali Pro Bloom A. It's compatible with rockwool, coco coir, deep water culture, ebb and flow, NFT, and soil setups.

About Emerald Harvest Cali Pro Bloom

Cali Pro Bloom A and Bloom B make up the flowering half of Emerald Harvest's 2-part Cali Pro lineup, developed as a simpler two-bottle alternative to the Santa Rosa, California brand's original 3-part Grow, Micro, Bloom system.

Frequently Asked Questions

Why does Cali Pro Bloom split A and B into separate bottles?

Certain mineral salts in a bloom formula — particularly calcium paired with sulfates and phosphates — precipitate out of solution if concentrated together in one bottle. Splitting them into A and B keeps the concentrate stable until both are diluted into the reservoir.

How do I mix Bloom A and Bloom B correctly?

Fill the reservoir with water first, then add Bloom A and stir thoroughly before introducing an equal measure of Bloom B. Never pour the two concentrates directly into each other — always dilute each one into the reservoir separately.

What's the difference between Bloom A and Bloom B?

Bloom A carries the calcium and part of the chelated micronutrient load, while Bloom B carries the phosphate, sulfate, and remaining minerals that would react with Bloom A's calcium if combined at full strength. Used together in equal portions, they supply the complete bloom-phase nutrient profile.

Can Cali Pro Bloom A be used without Bloom B?

No, Bloom A alone doesn't supply the complete macro- and micronutrient profile for flowering. It's formulated to be used in equal portions with Bloom B.

Is Cali Pro Bloom A compatible with hydroponic and soil systems?

Yes, it works across rockwool, coco coir, deep water culture, ebb and flow, NFT, and soil growing setups. Follow label dilution rates for your specific system and reservoir size.