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The P and K your plants need in flower —
from the cleanest sources on mother earth.

Name: KiS Organics Large Bloom Booster 2-8-6
Brand: KiS Organics
SKU: KIS-BLOOM-05GAL
Price: 144.95 USD
Availability: InStock

Most organic bloom boosters source phosphorus from bat guano or mined rock phosphate - both carry elevated cadmium and lead. KiS built this around fish bone meal instead: a cleaner P source, paired with potassium sulfate, insect frass, alfalfa meal, gypsum, and wollastonite. Dry top-dress - apply, scratch in lightly, water. The Large bag has 65 cups, sized for multi-plant grows or repeat runs.

No guano · No rock phosphate No synthetics · No fillers Low heavy metal sourcing

Free shipping on orders over $49

30-day returns on all orders

Serving growers since 2006

Why it matters how P is sourced

Traditional PK Boosters vs. KiS Organics Bloom Booster

Typical Organic P/K Boosters

Guano and mined rock phosphate carry elevated cadmium and lead
Heavy metal contamination is the most common reason organic grows fail third-party testing
Guano sourcing raises ecological concerns - bat colonies disturbed for harvest
Liquid PK boosters require measuring, pH testing, and per-watering dosing
Most dry bloom boosters designed for field/garden use, not container timing
Single P/K focus - no supporting inputs for cell wall structure or pest suppression

KiS Bloom Booster 2-8-6

Fish bone meal as the P source - cleaner heavy metal profile than guano or rock phosphate
Developed specifically to minimize heavy metal levels - not a reformulated field blend
No guano - potassium sulfate and insect frass are the K and secondary N sources
Dry top-dress - sprinkle on, water in, done. No measuring liquids or pH testing
Application schedule designed for containers and raised beds specifically
Wollastonite and gypsum included for calcium, silicon, and sulfur support

What the Large bag gets you

65 cups

Total volume in the Large bag - 268g per cup

130x

Top-dress a 5-gal pot at the full rate (½ cup per application)

65 sq ft

Raised bed coverage at ½ cup per sq ft (single application)

65x

Top-dress a 10-gal pot at the full rate (1 cup per application)

What's in it and why it matters

Six ingredients, each doing a specific job

Fish bone meal - high phosphorus without the heavy metal risk No guano

Guano and mined rock phosphate regularly carry elevated cadmium and lead. Fish bone meal delivers comparable phosphorus from skeletal calcium phosphate - a cleaner source that doesn't carry the same geological contamination profile.

Potassium sulfate - soluble K plus sulfur, no chloride buildup

Provides potassium for flower energy and water balance plus sulfur for amino acid synthesis, without the chloride salt accumulation that comes with the cheaper potassium chloride alternative.

Insect frass - slow-release nitrogen plus chitin Dual function

Contributes nitrogen to prevent early-flower deficiency, and delivers chitin - which triggers the plant's systemic immune response against fungal pathogens and certain pests without any spray program.

Alfalfa meal - fast nitrogen plus triacontanol

Fast-releasing dry nitrogen source that also contains triacontanol - a natural plant growth hormone that stimulates root growth and can accelerate early flower site development.

Wollastonite - calcium silicate for cell wall strength Uncommon ingredient

Calcium silicate (CaSiO₃) provides calcium and silicon simultaneously. Silicon deposits in plant cell walls, mechanically strengthening them against pest pressure and stress - rarely found in pre-blended bloom amendments.

Gypsum - calcium and sulfur without affecting pH

One of the only calcium sources that doesn't raise soil pH on application - useful in a living soil that's already pH-buffered by the base mix, and mildly improves drainage in dense container profiles.

Specs

Numbers and details

NPK Analysis

2 – 8 – 6

Bag Size (Large)

65 cups · ~38 lbs

Container Rate

½ cup per 5-gal pot

Raised Bed Rate

½ cup per sq ft

Container Frequency

Every 2–3 weeks, late veg through mid-flower

Bed Frequency

Once at flower start; optional second mid-flower

Cup Weight

268g per cup · 1.69 cups per lb

Application Method

Top-dress, scratch in lightly, water

Full Ingredient Disclosure

Alfalfa meal, Fish bone meal, Potassium sulfate, Insect frass, Gypsum, Wollastonite.

How to apply

1

Start at late veg or flower flip

Begin when flower sites are forming. Containers 15 gal and under: apply every 2–3 weeks. Beds: single application at flower start is usually enough.

2

Measure and top-dress

½ cup per 5-gal container, scaled for larger pots. ½ cup per sq ft for raised beds (a 4×4 bed = 8 cups). Sprinkle evenly and scratch lightly into the top half-inch if possible.

3

Water in thoroughly

Water to field capacity immediately after applying. The dry amendments require moisture to activate - don't let them sit dry on the surface.

4

Optional second application mid-flower

For heavy feeders or pots under 10 gal, a second application mid-flower keeps P and K from running short. Stop all applications 4–6 weeks before harvest.

In the bag

Large bag contents - and which size fits your setup

Large bag includes

65 cups of Bloom Booster 2-8-6 (~38 lbs)
Fish bone meal - organic phosphorus, low heavy metal profile
Potassium sulfate - available K plus sulfur, no chloride buildup
Insect frass - slow-release N plus chitin for plant immunity
Alfalfa meal - fast N plus triacontanol growth hormone
Wollastonite + gypsum - calcium, silicon, and sulfur support

Size comparison - which bag to buy

Small (5 cups) - 10 top-dresses on a 5-gal pot
Regular (23 cups) - ~46 top-dresses on a 5-gal pot
Large (65 cups) - ~130 top-dresses on a 5-gal pot
Works with: KiS Water Only Soil, KiS Biochar Mix, and any other organic living soil

Not sure which size fits your setup? Call or email - we'll help you figure out exactly how many applications you need per cycle. 716-217-0353 / help@happyhydro.com

Questions

Frequently asked questions

Do I need this if I'm already running KiS Water Only or Biochar Soil?

The KiS soils carry most plants through a full cycle without it. The Bloom Booster is most useful for heavy-feeding varieties in containers 15 gal and under, or when you want to proactively push P and K through peak flower demand rather than wait for deficiency signs. KiS includes a cup of it with their Westport Soil Blend - it's an optional push, not a required fix.

Why does phosphorus source matter for heavy metals?

Bat guano picks up metals from the insects bats eat; mined rock phosphate is co-deposited with cadmium in geological formations. Fish bone meal sources phosphorus from skeletal calcium phosphate - it doesn't carry the same contamination profile. KiS built this formula around that difference specifically.

Will this burn my plants or disrupt my soil biology?

At the recommended rate, no - nutrients are biologically bound and release at a pace the plant can use. Don't apply at 2–3x the rate; the alfalfa meal can spike nitrogen if over-applied. Gypsum, wollastonite, and potassium sulfate are all pH-neutral and won't disrupt your soil buffer.

Can I use this on non-KiS soils?

Yes - on any biologically active organic soil. The dry amendments need living microbes to break them down and cycle them into plant-available forms. They won't work well in sterile or inert media. Application rates and timing are the same regardless of soil brand.

When should I stop applying before harvest?

Stop 4–6 weeks before your target harvest date. Applying too close - especially the alfalfa meal - can push nitrogen-driven green growth when the plant should be finishing. The late flower period is when you back off, not add more.

What if I receive a damaged bag or the product isn't right for my setup?

Email a photo of any damage to help@happyhydro.com and we'll make it right - replacement or refund, your call. Change-of-mind returns accepted within 30 days on items in new condition. Not sure this is right before ordering? Call us at 716-217-0353.

Why buy KiS Organics Bloom Booster from Happy Hydro?

Happy Hydro has been selling growing equipment and amendments since 2006. We carry KiS because the formulas are thought through - the heavy metal sourcing on this product is a good example. Call 716-217-0353 or email help@happyhydro.com.

Why Buy From Happy Hydro

Happy Hydro began as a pipe dream in a garage and has grown into something built almost entirely on word of mouth and repeat customers. Rather than focusing on raising margins and obsessing over profits, we've always believed that the right combination of competitive prices, superior products, and world-class customer service speaks for itself. Our philosophy will never change: when you're happy, we're happy.

Our commitment

What you can expect from Happy Hydro

Real People, Real Growers

Our grower support team isn't a call center. They know the products because they're passionate about growing. Reach us Monday-Friday, 10 am-4 pm EST at 716-217-0353 or help@happyhydro.com, before you order or after.

Hand-Picked by Growers, for Growers

Every brand we carry was chosen by our founders because it performs. We only stock premium brands we believe in, and every item is inspected before it leaves our warehouse.

Fair Prices and Free Shipping

We work hard to keep our prices as low as manufacturers allow, and we include free shipping on orders over $49 so there are no surprises at checkout. Find a lower price anywhere and we'll match it.

Authorized for Every Brand We Carry

We're an authorized dealer for every manufacturer on our site. That means you get the full manufacturer's warranty on every purchase. No grey market, no expired stock.

30-Day Returns on Most Orders

Hard to commit to a product you haven't tried. Return most items within 30 days in original condition and we'll take care of it. Read the full policy.

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Every transaction is SSL encrypted. We don't store payment information and we will never sell your data to anyone, ever.

Volume and Commercial Pricing

If you're a commercial grower or putting together a large order, reach out before you buy. We have pricing available that we can't advertise publicly. Call 716-217-0353 or email help@happyhydro.com and we'll take care of you.

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KiS Organics Large Bloom Booster 2-8-6

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