✔ Nutrient blend designed for flowering plants.
✔ Promotes dense bud growth and terpene production.
✔ Enhanced with Calcium and Magnesium.
✔ Vegan and planet friendly chelated nutrients.
Save 20% When You Buy 5 or More.
Reefertilizer® Bloom is the final step of our feeding program. Powerful chelated fertilizer provides immediately available nutritional elements to your plants.
Enhanced with calcium and magnesium, Reefertilizer Bloom will help fuel flower development and terpene production. One bag will help grow up to 8 plants.
Reefetilizer Bloom makes feeding your plants during their flowering phase an absolute breeze. No more mixing A and B liquids! All you need for big terpy buds is in this one powder.
Start feeding your plants Reefertilizer Bloom when you switch lights to 12/12 indoors or when preflowers appear outdoors.
| Flower Weeks 1-3 | 5ml scoop mixed into 4L of water |
| Flower Weeks 4-8 | 10ml scoops mixed into 4L of water |
| Additional Flower Weeks | 10ml scoops mixed into 4L of water |
| 1-2 weeks before harvest | Flush plants with plain water |
Add the recommended amount of Grow to water.
Add the recommended amount of Grow to water.
Add the recommended amount of Grow to water.
Note: Stabilizer in the Bloom powder might not fully dissolve. These will break down naturally and won’t harm your plants or irrigation system.
Reefertilizer® Bloom
When plants begin to flower, their nutritional requirements change. Early on in flower, the plant will use its stored nitrogen for a quick growth spurt. After this short period , your plants will need nutrients with a higher ratio of phosphorus and potassium. These elements will fuel flower growth.
Reefertilizer Bloom also provides micronutrients such as calcium and magnesium. These two elements are common deficiencies and are proven to increase bud size and help terpene production. Each bag feeds up to 8 plants.
Guaranteed Analysis
(A fancy way of saying total weight by volume)
| Total Nitrogen (N) | 5% |
| Available Phosphate (P2O5) | 30% |
| Soluble Potash (K2O) | 20% |
| Calcium (Ca) | 4% |
| Magnesium (Mg) | 3% |
| Boron (B) | 0.02% |
| Copper (Cu) | 0.05% |
| Iron (Fe) | 0.10% |
| Manganese (Mn) | 0.05% |
We created our products to make it easier for folks like you to start growing their own crops at home.
We provide our Beginner’s Guide to Cultivation free with each order and to our email subscribers.
Learn the basics of growing; from germinating seeds, caring for your plants through veg and flower, as well as processing that harvest you worked so hard to grow.
Written by Mike Drouin; an experienced grower and co-founder of Reefertilizer nutrients.
Customer Images
Is Bloom Synthetic? Is that bad?
Reefertilizer Bloom is a synthetic fertilizer. Plants and soil microbes feed off the same elements provided by either organic or synthetic nutrients. A healthy living soil will maximize the amount of nutrients your plants can absorb.
Over-fertilization can be a issue but is easily fixed by flushing plants with water.
Bloom contains the highest quality chelated nutrients which are immediately available to plants and reduce wasted nutrients. Lower quality nutrients brands contain urea and other forms of nutrients that are not as easy to absorb and can end up in waste water runoff.
What makes Reefertilizer Bloom different from other bloom boosters?
Other bloom boosters usually need to be used with a full NPK fertilizer. Reefertilizer Bloom has a NPK ratio perfect for plants in flower as well as all the other micronutrients in bloom boosters.
Enhanced with calcium and magnesium, Reefertilizer Bloom reduces the number of additional inputs you might need.
Our goal at Reefertilizer is to get more folks growing their own plants. Reefertilizer provides easy-to-use and affordable nutrients along with straightforward guidance and support.
We designed our products to be lighter and have less packaging than our competitors and we’re happy to offer a 30-day return policy if you’re not happy with our products.
We’re not “big fertilizer”, we’re just three guys who love growing amazing plants.
When do I start feeding my plants Reefertilizer Bloom?
When you start to see flowers begin to form around the nodes (where the branch meets the stem) you can switch to feeding your plants Bloom. For autoflowers, this is usually 3 or 4 weeks in. For outdoor plants, this is usually around July or August in the northern hemisphere.
How much do I feed my plants?
Start with 1 scoop (5ml) for every 4L (1 gallon) of water. Feed each plant weekly with enough of this solution to fully saturate the soil and have a bit of runoff. You can water your plants as needed in between feedings. Some folks split the dose and feed twice a week. Both work fine, pick whichever method is easier for you.
When I mix the Bloom powder it doesn’t dissolve completely, what gives?
What you’re seeing are left over stabilizers in the powder. These stabilizers are inert, completely safe, and won’t harm your plants or injectors. They will slowly break down over time in your soil or coco mediums.
Can I pre-mix these nutrients?
Because these are chelated nutrients they don’t do well being mixed into water and stored for long periods of time. The elements within the solution can react with each other and lower the effectiveness of the fertilizer. A few days is okay, but anything longer than a week might not be a good idea.
Reefertilizer was designed to make growing amazing plants at home easier than ever. The Reefertilizer grow kit will feed your soil as well as up to 8 plants with no need for additional inputs.
When all three are working together a successful harvest is easy to achieve.
Great product, great results but at 50% of recommended amount. This is not unique to Reeferfertilizer and really a bonus for me. Im not sure why, but any nutrients I’ve used to grow cannabis, the recommended dose is too much. Use this product at 10ml per 8L of water instead of 4L and results are outstanding.
First grow in 30 years highly successful thanks to Mike and reefertilizer products
Works well.
Seemed to work great. Nice grey ash and no taste. Trouble dissolving minus a star.
Very satisfied. Looking forward to getting the whole system for next spring
Great stuff.
Great results at the end of my crop!! Will def order again saw a difference in bud size for sure.
First harvest. Things west better than expected.
Used this last season with fantastic results.
This product is a must for healthy plants. Will use it again next growing season. If you’ve never tried it you’re missing out.
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Reefertilizer® Grow Veg Nutrients for Cannabis 
Very satisfied. Looking forward to getting the whole system for next spring
This product is a must for healthy plants. Will use it again next growing season. If you’ve never tried it you’re missing out.
Used this last season with fantastic results.