Emerald Harvest Bloom, 2.5 gal

Emerald Harvest Bloom is the flowering-phase component of Emerald Harvest’s professional 3-part base nutrient series — Grow, Micro, Bloom. Designed for high-yield gardens, it supplies phosphorus, potassium, and a full complement of secondary and chelated micronutrients to support heavy fruiting and flowering from the transition phase through to harvest. The 2.5-gallon size provides enough concentrate to sustain a mid-to-large operation through multiple feeding cycles without constant reordering.

Emerald Harvest Bloom Specifications

The following specifications are derived from the product title, supplier SKU, and the canonical description provided by the manufacturer for the Grow, Micro, Bloom series.

Specification	Value
Brand	Emerald Harvest
Product Series	Grow, Micro, Bloom (3-Part Base Nutrients)
SKU	EMHB25
Pack Size	2.5 gallons (approx. 9.46 L) — liquid concentrate
Primary Macronutrients	Nitrogen (N), Phosphorus (P), Potassium (K)
Secondary Nutrients	Calcium (Ca), Magnesium (Mg), Sulfur (S)
Chelated Micronutrients	Iron (Fe), Copper (Cu), Manganese (Mn), Zinc (Zn)
Growth Stage	Flowering and fruiting (used in combination with Grow and Micro)

Why Choose Emerald Harvest Bloom

The Grow, Micro, Bloom series is structured around adjustable ratios, which means the Bloom component can be dialed up or down depending on where a garden is in its flowering cycle. Many growers who have used fixed 2-part systems find that the 3-part approach gives them more room to respond to specific plant signals — stretching or reducing the bloom-phase ramp as conditions require.

Bloom carries a full slate of trace elements alongside the primary N-P-K ratios. Calcium, magnesium, and sulfur are included as secondary nutrients, and chelated iron, copper, manganese, and zinc round out the micronutrient profile. Chelation improves solubility and uptake efficiency, which is relevant when working in recirculating hydroponic systems where nutrient lock-out from pH fluctuations is a real concern.

Emerald Harvest positions this series for experienced growers who want the freedom to write their own feed charts rather than follow a fixed manufacturer schedule. The series is designed to support gardens from early vegetative growth through late flowering, with Bloom taking a larger share of the mix as flowering develops. Growers who prefer hands-on control over their programs tend to do well with this format.

The 2.5-gallon bottle size is practical for operations that mix nutrients frequently. It reduces the per-ounce cost compared to quart sizes and avoids the storage and shipping overhead of drum quantities. For most mid-scale indoor gardens running regular reservoir changes, a 2.5-gallon jug of Bloom will last through several feeding cycles before needing replacement.

Best Uses for Emerald Harvest Bloom

• Recirculating hydroponic systems (DWC, NFT, RDWC): Bloom dissolves readily in water and is suited to reservoir-based systems where nutrients are mixed fresh at each reservoir change. Its chelated micronutrients stay available across the pH range typical of hydro setups.
• Flowering and fruiting phase: The series is explicitly designed to carry plants from early vegetative growth through to harvest. Bloom is mixed at increasing ratios as the plant moves deeper into its flowering cycle, replacing a larger share of the Grow component in the feed chart.
• Custom feed programs: Growers who keep detailed grow logs and adjust nutrient ratios week-to-week will get the most out of this series. The 3-part format allows independent adjustment of macro and micronutrient delivery in ways that a 2-part or 1-part system does not.
• High-yield garden management: For operations where maximizing genetic potential is the primary goal, this series is formulated to provide the nutritional completeness that demanding, high-output varieties require across their full life cycle.
• Paired use alongside grow lighting systems: When running intensive lighting setups — such as a high-output T5 fluorescent fixture during early veg — having a 3-part nutrient system that can be adjusted to match the growth rate the lighting drives is a practical advantage.

Emerald Harvest Bloom vs Similar Products

Emerald Harvest Bloom occupies the 3-part base nutrient category alongside other professional series such as General Hydroponics Flora Series and Botanicare Pure Blend Pro. The main distinction is in how the ratios are structured and how the brand expects growers to use its feed chart. Like its competitors, the Grow, Micro, Bloom series requires all three components to be used together — Bloom alone does not cover the full nutritional profile a plant needs.

Growers who have switched from a fixed 2-part base nutrient to a 3-part series generally report that the added flexibility is worth the extra mixing step, particularly during the transition from vegetative to flowering growth where dialing back nitrogen and increasing phosphorus and potassium matters for flower set. The 3-part format makes that transition gradual and controllable rather than binary.

If you are currently running a simpler nutrient program and considering moving to a 3-part system, bear in mind that Bloom must always be paired with Grow and Micro at ratios appropriate for the growth stage. The full feed chart is available from Emerald Harvest’s website and is the recommended starting point before deviating toward custom ratios.

For growers who also want to optimize their growing environment, pairing a well-structured nutrient program with quality bloom-phase nutrients from other leading brands can offer a useful comparison point when dialing in your own feed schedule.

Compatibility

Emerald Harvest Bloom is a water-soluble liquid concentrate compatible with most hydroponic and soilless growing media. It is intended to be used as part of the complete Grow, Micro, Bloom 3-part series. Using Bloom in isolation is not recommended — the full elemental profile requires all three parts mixed at stage-appropriate ratios.

The series works across common growing media including rockwool, expanded clay (hydroton), coco coir, perlite, and deep water culture reservoirs. It can also be used in soil and soilless potting mixes, though many growers using soil-based media prefer a different nutrient formulation designed around organic matter interactions.

As with all concentrated liquid nutrients, verify that the mixed solution pH falls within the appropriate range for the growing medium before watering. For hydroponic applications, a pH of 5.5–6.2 is a standard working range. For coco and soilless mixes, 5.8–6.3 is typical. Measure EC after mixing to confirm the solution strength matches the target for the growth stage and plant size. When also tracking environmental controls, a well-sealed grow tent helps maintain the consistent temperature and humidity conditions that support efficient nutrient uptake.

Dosing Guidelines

Emerald Harvest publishes a feed chart for the Grow, Micro, Bloom series that covers each week of the vegetative and flowering cycles. That chart is the recommended reference for starting doses, as it accounts for the interplay between all three components. The following are general guidelines consistent with the product description — always cross-reference with the manufacturer’s current feed schedule.

• Early flowering: Begin increasing Bloom ratios relative to Grow as the plant transitions from vegetative growth. The exact ratio shift depends on the feed chart week and the plant’s response.
• Peak flowering: Bloom typically reaches its highest proportion in the mix during weeks 4–6 of flowering (for most annual fruiting crops), with Micro held at a consistent level and Grow reduced to a maintenance dose.
• Late flowering / pre-harvest: Many experienced growers reduce overall nutrient concentration and shift entirely to Micro and Bloom (dropping Grow), then transition to a flush or clean water period in the final days before harvest. Consult the manufacturer feed chart for their recommended end-of-cycle protocol.
• Dose rate: Follow the current Emerald Harvest feed chart (available at emeraldharvest.co) for the specific mL-per-gallon or mL-per-litre rates. Do not exceed the recommended dose without careful monitoring of runoff EC, as overfeeding is a common source of nutrient burn in heavy-feeding varieties.
• Mixing order: Always add Micro to water first, then Grow, then Bloom. This order prevents nutrient precipitation that can occur when concentrated components are mixed directly together.

How to Use Emerald Harvest Bloom

1. Shake the bottle before each use to ensure the concentrate is uniformly mixed. Settling can occur in liquid nutrients that contain suspended mineral compounds.
2. Start with pH-adjusted water at the correct temperature for your system. Add Micro first, stir, then add Grow, stir again, and finally add Bloom. Mixing in this order reduces the risk of calcium-phosphate precipitation.
3. Measure doses using a calibrated syringe or measuring cup. Estimate doses by weight or volume against the manufacturer’s mL-per-gallon rate for the current feed chart week and growth stage.
4. Check the mixed solution EC with a calibrated meter to confirm it falls within the target range for the current stage. Seedlings and young plants require lower EC than mature plants in peak flowering.
5. Adjust pH to the target range for your growing medium after all nutrients are added. pH correction after nutrient addition is more accurate than correcting before, as the nutrients themselves shift pH somewhat.
6. Record the mix. Note the date, EC, pH, and ratios used. This log becomes the basis for adjusting the feed program in subsequent weeks based on how plants respond.
7. Adjust weekly based on plant response and runoff or drain-to-waste EC readings. If runoff EC is significantly higher than the input, reduce dose concentration. If plants show yellowing or slow growth, re-evaluate the ratio balance or check for pH-related lock-out.

Sources & Further Reading