Emerald Harvest Bloom - Part of the Grow, Micro, Bloom 3-Part System
Best for: growers running the Emerald Harvest 3-part base nutrient system who need the flowering-stage component for fruit and flower development.
Our thoughts
Emerald Harvest's 3-part system is built to be adjusted, not just poured in at one fixed ratio, which suits growers who like to dial feed up or down as plants move through their cycle. Bloom is the phosphorus and potassium half of that equation. It's a straightforward, no-drama nutrient that does what a bloom formula should.
Emerald Harvest Bloom is the flowering-stage component of the brand's Grow, Micro, Bloom 3-part base nutrient line, developed under the Hawthorne Gardening umbrella (the group behind General Hydroponics). It supplies phosphorus and potassium, drawn from sources including monopotassium phosphate, potassium sulphate and magnesium sulphate, aimed at supporting bud and fruit development through flowering.
Used alongside Grow and Micro, the three parts let you shift the feed ratio as plants move from vegetative growth into flowering, rather than being locked into a single fixed-ratio bottle. The system works across rockwool, coco coir, perlite/hydroton and deep water culture.
How it compares
Emerald Harvest sits in the same 3-part category as some of the best-known base nutrient lines on the market.
- General Hydroponics' Flora series (FloraGro/Micro/Bloom) is the closest comparison, both are made under the same parent company and follow the same 3-part logic.
- Advanced Nutrients' pH Perfect line automates pH buffering into the formula, which Emerald Harvest doesn't do, so you'll still need to check and adjust pH yourself.
- Canna Coco is a popular 2-part alternative for coco growers who want fewer bottles to manage, at the cost of some flexibility in ratio adjustment.
You're getting a flexible, adjustable 3-part system rather than an all-in-one formula, at a mid-range price point.
Usage guidance
Bloom is designed to be used alongside Grow and Micro, not on its own.
Feeding ratio
Increase Bloom relative to Grow as plants move from vegetative growth into flowering, following the brand's feed chart for your grow medium.
Mixing order
Add Micro to water first, mix well, then add Bloom, then Grow, mixing between each to avoid nutrient lockout from concentrated parts touching directly.
pH
Check and adjust pH after mixing, aim for 5.8-6.3 in coco or soilless media, or 5.5-6.5 in rockwool/hydro.
Technical specifications
- NPK ratio: 0-5-4
- Key sources: Monopotassium phosphate, potassium sulphate, magnesium sulphate
- System stage: Flowering (part of Grow/Micro/Bloom 3-part)
- Compatible media: Rockwool, coco coir, perlite/hydroton, DWC
- Sizes available: 0.95L and 3.79L
- Brand/parent company: Emerald Harvest, Hawthorne Gardening
Who this is for
- Growers already running Emerald Harvest Grow and Micro who need the matching Bloom component
- Anyone who wants to adjust feed ratios through the grow cycle rather than use a fixed-ratio formula
- Coco, rockwool and hydro growers running a flexible 3-part system
Best suited to growers who are happy managing a 3-bottle system for the flexibility it gives.
Our take
It's a solid, well-formulated half of a proven 3-part system rather than a gimmick bloom booster. If you're already on Grow and Micro, this is the obvious next bottle.
Does exactly what it should, day in, day out, worth picking up if you want a nutrient system you can actually adjust as your plants change.
