Premium bloom-stage concentrate in our 4-part hydroponic system. High phosphorus and potassium drive abundant flowering, essential oil production, and top-tier harvest quality.
Elevated phosphorus drives ATP energy transfer, bud initiation, flower density, and essential oil production during the critical bloom stage.
Industry-leading potassium level enhances flower quality, color, aroma, sugar transport, and overall harvest weight for premium results.
Low nitrogen with high P-K is specifically engineered for flowering crops, directing energy away from foliage and toward bud and fruit production.
Works synergistically with Cal-Mag Plus, Grow Green, and Micro Green for complete, balanced nutrition from seedling through harvest.
Dissolves completely for immediate nutrient availability. No sediment, no clogged lines, and no shaking required unlike liquid competitors.
Every batch independently lab tested for heavy metal content. When growing food or medicine, purity is non-negotiable.
Dry powder format never expires when stored sealed. Liquid bloom fertilizers degrade in 1–3 years — Blossom Green stays potent indefinitely.
Concentrated dry formula costs a fraction of liquid bloom products. No paying to ship water — just pure nutrients at commercial-grade value.
Feeding schedule includes transition-stage ratios so you can gradually shift from Grow Green to Blossom Green without shocking plants.
Registered with the California Department of Food and Agriculture. Guaranteed analysis verified for commercial and hobbyist growers alike.
Blossom Green 2-6-8 is formulated from pharmaceutical and reagent-grade raw materials selected for maximum solubility, purity, and plant availability in hydroponic systems.
Primary source of both phosphorus and potassium. Fully water-soluble with excellent pH stability for hydroponic reservoirs.
Chloride-free potassium source that also supplies sulfur. Preferred for sensitive flowering crops where chloride can reduce quality.
Highly concentrated nitrogen source providing the minimal 2% N needed to maintain amino acid synthesis during bloom without promoting excess foliage.
The Blossom Green ratio deliberately tapers nitrogen while maximizing the phosphorus and potassium that flowering plants demand most. This P-K heavy profile supports the metabolic shift from vegetative growth to reproductive development.
Low nitrogen prevents excessive vegetative growth during bloom, directing the plant's energy toward flower and fruit production rather than leaf expansion. Just enough N to sustain amino acid synthesis and healthy tissue.
Phosphorus is the engine of flowering. It powers ATP energy transfer, drives bud initiation and flower density, supports essential oil biosynthesis, and ensures proper seed and fruit maturation.
Elevated potassium enhances photosynthesis efficiency, sugar transport to developing flowers, cell turgor for firm tissue, and the color, aroma, and weight that define a premium harvest.
At 2-6-8, Blossom Green delivers more potassium per application than most liquid bloom formulas (typically 4–7% K), translating to measurably better flower quality and harvest weight.
Dry powder means no water weight, no degradation over time, and precise control over stock solution concentration. Mix exactly what you need, when you need it.
Designed from the ground up to work with Cal-Mag Plus, Grow Green, and Micro Green. No guesswork about compatibility — every ratio in the feeding schedule is tested and optimized.
| Feature | Blossom Green 2-6-8 | GH FloraNova Bloom 4-8-7 | FoxFarm Tiger Bloom 2-8-4 |
|---|---|---|---|
| NPK Ratio | 2-6-8 | 4-8-7 | 2-8-4 |
| Potassium (K) | 8% — highest | 7% | 4% — lowest |
| Form | Dry powder (dissolves instantly) | Thick liquid (must shake vigorously) | Liquid |
| Shelf Life | Indefinite | ~1 year | 2–3 years |
| System Design | 4-part complete system | 1-part (may need supplements) | 3-part (Grow Big + Big Bloom + Tiger Bloom) |
| Heavy Metal Testing | Independently lab tested | Not published | Metals listed on AAPFCO database |
| Cost per Gallon of Solution | ~$0.10 | ~$0.30+ | ~$0.25+ |
| Shipping Weight | Light (dry concentrate) | Heavy (liquid) | Heavy (liquid) |
| Feeding Schedule | Full 7-stage schedule included | Basic feed chart | Basic feed chart |
Blossom Green 2-6-8 is one part of our complete 4-part hydroponic system. Use together with Grow Green, Micro Green, and Cal-Mag Plus for best results.
| Product | Package → Water | Concentration | Shelf Life |
|---|---|---|---|
| Cal-Mag Plus 2-0-0 | 2.5 lb → 1 gal | 2.5 lb/gal | 6+ months |
| Grow Green 4-2-6 | 1.7 lb → 1 gal | 1.7 lb/gal | 6+ months |
| Micro Green 2-0-3 | 1.5 lb → 1 gal | 1.5 lb/gal | 6+ months |
| Blossom Green 2-6-8 | 1.8 lb → 1 gal | 1.8 lb/gal | 6+ months |
| Package Size | Water Needed | Stock Solution Yield |
|---|---|---|
| 1.8 lb | 1 gal | 1 gal concentrate |
| 9 lb | 5 gal | 5 gal concentrate |
| 18 lb | 10 gal | 10 gal concentrate |
| 36 lb | 20 gal | 20 gal concentrate |
| Growth Stage | Cal-Mag Plus 2-0-0 | Grow Green 4-2-6 | Micro Green 2-0-3 | Blossom Green 2-6-8 | EC Target | pH Range |
|---|---|---|---|---|---|---|
| Seedlings/Clones (Week 1–2) | 2.5 | 1.25 | 1.25 | 1.25 | 0.5–0.8 | 5.5–6.5 |
| Early Vegetative (Week 3–4) | 5 | 5 | 5 | 5 | 1.0–1.4 | 5.5–6.5 |
| Late Vegetative (Week 5–6) | 7.5 | 15 | 10 | 5 | 1.4–1.8 | 5.5–6.5 |
| Transition (Week 7–8) | 10 | 10 | 10 | 10 | 1.6–2.0 | 5.5–6.5 |
| Early Bloom (Week 9–10) | 10 | 5 | 10 | 15 | 1.8–2.2 | 5.5–6.5 |
| Peak Bloom (Week 11–13) | 10 | 0 | 10 | 20 | 2.0–2.5 | 5.8–6.5 |
| Late Bloom / Flush (Week 14+) | 5 | 0 | 7.5 | 15 | 1.5–2.0 | 5.8–6.5 |
| System Type | Feed Schedule | Special Notes | Reservoir Change |
|---|---|---|---|
| DWC / RDWC | Continuous | Monitor pH daily | Weekly |
| NFT | Continuous | Check EC twice daily | Weekly |
| Ebb & Flow | 2–4× daily | Adjust strength by flood frequency | Weekly |
| Drip / DTW | Multiple daily | Maintain 10–20% runoff | N/A |
| Coco Coir | 1–2× daily | Never let dry; always use Cal-Mag | N/A |
| Aeroponics | ~15 min cycles | Use ~75% concentration | Weekly |
At peak bloom (weeks 11–13), EC can climb quickly as plants drink more water than they uptake nutrients. If EC rises above 2.5, top off with plain pH-adjusted water rather than adding more nutrient solution. This prevents salt buildup and keeps phosphorus and potassium available where it matters most — at the root zone.
Refer to the Safety Data Sheet (SDS) in the Documents section for complete safety information.
Blossom Green works best as part of our complete 4-part hydroponic nutrient system. Each component is formulated to work together without compatibility issues.
Calcium, magnesium, and iron base. Always add first to prevent nutrient precipitation — especially critical with RO water and coco coir.
Veg StageHigher nitrogen formula for vigorous vegetative growth. Build strong structure before switching to Blossom Green at flower initiation.
EssentialComplete chelated micronutrient package. Prevents hidden hunger throughout the entire grow cycle, including the high-demand bloom stage.
Best ValueGet all four components together at a bundled price. Everything you need from seed to harvest in one order.
Switch at flower initiation (e.g., 12/12 light cycle for photoperiod crops). During the transition period (weeks 7–8), use equal parts Grow Green and Blossom Green at 10 ml/gal each. Then taper Grow Green to 0 and increase Blossom Green to 20 ml/gal at peak bloom. For more on bloom-stage feeding, see our guide on Flower Fertilizer 101.
Phosphorus is critical for ATP energy transfer, bud initiation, flower density, maturity timing, and essential oil production. Without adequate phosphorus during bloom, plants cannot efficiently convert light energy into the chemical energy needed for flower development. Learn more in our article on the function of phosphorus in plants.
Potassium drives sugar transport, photosynthesis efficiency, and cell turgor — all of which directly impact flower size, aroma, color, and harvest weight. Many liquid bloom formulas only contain 4–7% K, which can limit quality during peak bloom. See our deep dive on the function of potassium in plants.
Yes — always add Cal-Mag Plus first to prevent calcium and phosphorus precipitation that makes both nutrients unavailable. This is especially important because Blossom Green is phosphorus-rich. Mixing concentrated phosphorus with concentrated calcium directly creates insoluble calcium phosphate.
Calcium and phosphorus react in concentrated form to produce insoluble calcium phosphate — essentially cement. By diluting Cal-Mag Plus into the reservoir first, you keep the calcium concentration low enough that phosphorus from Blossom Green remains fully dissolved and plant-available.
Target EC rises from 1.6–2.0 during transition to approximately 2.0–2.5 at peak bloom. Maintain pH between 5.8–6.5 during bloom, which is the optimal range for phosphorus availability. If EC climbs above 2.5, top off with plain pH-adjusted water.
Yes, at low rates. The feeding schedule includes 1.25–5 ml/gal during vegetative stages to ensure a baseline of phosphorus and potassium for root and structural development. The full 20 ml/gal rate is reserved for peak bloom only.
Blossom Green is hygroscopic (absorbs moisture from air). Keep the bag sealed tight between uses and store in a cool, dry place out of direct sunlight. If the powder clumps, break it up — efficacy is not affected. Dry powder has an indefinite shelf life when stored properly.
If you're not completely satisfied, we offer a 90-day money-back guarantee. Return the unused portion in its original packaging for a full refund — no questions asked.
1% of all profits go to the Greenway Foundation, focused on improving educational opportunities for children. Learn more at greenway.foundation.
Check out our full FAQ page or contact our experts for personalized advice.
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