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Xtreme Gardening Mykos Granular Pure Mycorrhizal Inoculum - Xtreme Gardening - Happy Hydro

Xtreme Gardening Mykos Granular Pure Mycorrhizal Inoculum

Xtreme Gardening
Price:
$32.25
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Description

Xtreme Gardening Mykos Granular Mycorrhizal Inoculum | Happy Hydro

Give every transplant a root network that feeds itself

Mykos is a single-species mycorrhizal inoculant containing only Rhizophagus intraradices at 300 propagules per gram. Applied directly to roots at transplant, it forms a symbiotic fungal network that extends far beyond the root zone to pull in water and nutrients the plant could never reach on its own. It works in soil, coco, peat, and rockwool, and it is compatible with both synthetic and organic fertilizer programs.

OMRI Listed CDFA Registered Single Species, No Fillers
Free shipping on orders over $49
30-day returns on all orders
Serving growers since 2006
Side by side
Untreated roots vs. Mykos-inoculated roots
No Mycorrhizae
  • Roots only absorb from their immediate surface area
  • Nutrients locked in clay or sandy pockets stay inaccessible
  • Transplant shock stalls growth for days or weeks
  • Plants wilt faster during heat or drought stress
  • Soil structure degrades without biological binding agents
  • Each plant is an island with no nutrient sharing
Mykos Granular
  • Hyphal threads extend far beyond the root zone, massively increasing absorption area
  • Fungal network mines locked-up phosphorus, zinc, copper, and moisture from surrounding soil
  • Colonizes new roots quickly, reducing transplant shock and getting plants established faster
  • Hyphal water storage acts as a buffer during heat and dry periods
  • Produces glomalin, a glycoprotein that binds soil particles and improves structure in clay or sand
  • Plants connect through the mycorrhizal network, sharing nutrients and water between root systems
What makes it different
One species, no competition, real colonization

100% Rhizophagus intraradices 300 propagules/g

No Trichoderma, no ecto-mycorrhizae, no filler species. A single endo-mycorrhizal strain means zero root competition, so colonization starts faster and stays stronger.

Works in 95% of Common Plants

Endo-mycorrhizae colonize vegetables, fruits, herbs, and flowers. Ecto-mycorrhizae (which Mykos deliberately excludes) only benefit certain trees and conifers.

Glomalin Production Improves Soil Structure

The fungal network secretes glomalin, a sticky glycoprotein that binds soil particles together. This improves water-holding capacity in sandy soils and drainage in clay.

Drought and Heat Stress Buffer

Hyphae store moisture in a sponge-like mass around the root zone, giving plants a reserve to draw from when watering is delayed or temperatures spike.

Compatible with Any Nutrient Program

Works alongside synthetic salt-based feeds, organic dry amendments, and compost teas. No need to change your existing feeding schedule.

Fresh, Live Organisms

Mykos granules contain living propagules, not freeze-dried spores. Manufactured and packaged in California by RTI, a family-owned company focused on beneficial soil microbes since 1993.

Specs
Technical details
Active Species
Rhizophagus intraradices (endo-mycorrhizal)
Propagule Count
300 propagules per gram
Formulation
Granular (for direct root contact)
Certifications
OMRI Listed, CDFA Registered Organic
Compatible Media
Soil, coco, peat, rockwool, raised beds
Manufacturer
RTI / Xtreme Gardening, California, USA
Sizes Available
1 lb ($20.85) and 2.2 lb ($32.25)
SKUs
RT4401 (1 lb), RT4402 (2.2 lb)

How to apply Mykos Granular

1

Dig your transplant hole

Dig the hole to the depth of your root ball. For containers, fill with your chosen medium and leave space for the plant.

2

Add Mykos directly to the roots

Sprinkle granules into the hole and onto the root ball. Mykos must make direct contact with roots to colonize. For containers: 1 to 2 tbsp for 1 to 3 gal pots, 4 to 6 tbsp for 5 to 7 gal, 1/2 cup for 10 to 20 gal.

3

Set the plant and backfill

Place the plant in the hole, fill around it with your soil or medium, and press gently to eliminate air pockets.

4

Water in and let it colonize

Water thoroughly after planting. The fungal network will begin colonizing roots within days and continue expanding throughout the plant's life.

In the bag
What you get and which size to pick
What's in every bag
  • Granular Rhizophagus intraradices inoculant
  • 300 propagules per gram
  • No Trichoderma, no ecto-mycorrhizae, no fillers
  • OMRI Listed for organic growing
  • Application rate chart on label
Sizes we carry
  • 1 lb (RT4401): Good for 10 to 30 transplants depending on pot size
  • 2.2 lb (RT4402): Better value per ounce for growers running 20+ pots or raised beds
  • Pair with: Xtreme Gardening Azos for nitrogen-fixing bacteria alongside the mycorrhizal network
Not sure which size? The 1 lb bag handles a typical home garden or a few rounds of indoor transplants. If you run 5-gal pots or larger, the 2.2 lb bag saves about 15% per ounce. Call or email us: 716-217-0353 / help@happyhydro.com
Questions
Frequently asked questions
You can, but it is much less effective. The granules need direct contact with living roots for the fungi to colonize. Mixing it throughout the soil means most of the propagules end up too far from roots to connect. Put it in the planting hole, directly against the root ball, and you will get far better results.
The granular form works well in coco, peat, rockwool cubes, and raised beds. For hydroponic reservoirs or drip systems where you cannot place granules on roots, Xtreme Gardening makes Mykos WP (Wettable Powder), which dissolves in water. We carry that separately if you need it for an established hydro setup.
No. Mykos is compatible with both synthetic and organic nutrient programs. Very high phosphorus levels can slow colonization because the plant has less incentive to trade carbohydrates for phosphorus, but normal feeding schedules will not kill the fungi. Avoid applying fungicides directly to the root zone, as those can harm the mycorrhizal network.
For containers: 1 to 2 tablespoons for 1 to 3 gallon pots, 4 to 6 tablespoons for 5 to 7 gallon pots, 1/2 cup for 10 to 20 gallon pots, and 1 cup for 25 to 50 gallon pots. For in-ground or raised beds, use 1 to 2 tablespoons per plant placed directly in the hole. For seeds, use about 1 tablespoon per foot of row or 1/2 teaspoon per cell or plug.
One application at transplant is enough for the life of that plant. The fungal network is self-sustaining once established, feeding on carbohydrates the plant provides through photosynthesis. There is no need to reapply unless you repot into fresh medium and disturb the root system significantly.
Multi-species blends often include ecto-mycorrhizae, which only colonize trees and conifers and have no benefit for vegetables, herbs, or flowers. They can also include competing organisms that slow colonization. Rhizophagus intraradices is the most widely researched endo-mycorrhizal species and colonizes the broadest range of garden and indoor plants.
If you receive a defective or damaged unit, email us a photo at help@happyhydro.com and we'll make it right immediately: replacement or refund, your call. For change-of-mind returns, we accept returns within 30 days for items in new, resalable condition. If you're not sure whether this product is right for your setup, call us first at 716-217-0353. We'd rather answer your questions before you order.
Happy Hydro has been selling growing equipment since 2006. We've carried Xtreme Gardening for years because the systems work great and customers who buy them leave happy. Have questions before you order? Call 716-217-0353 or email help@happyhydro.com. We're easy to reach and happy to help!

Your Happy Hydro Shipping Experience

We ship fast from Buffalo, NY. Most orders land at your door in 3-5 business days. Free standard shipping on orders $49+, plain-box packaging, and real humans ready to help if anything goes sideways.

Free shipping on orders over $49
Plain-box discreet packaging
Serving growers since 2006
What to expect
When you order from Happy Hydro

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Specs
Shipping details at a glance
Delivery time
3-5 business days
Default carrier
UPS Ground or USPS
Signature required
Orders over $500 only
Free shipping threshold
$49+ to the lower 48
International
Canada only Email help@happyhydro.com your address & a screenshot of your cart for a quote
Returns
30 days on most orders Exceptions apply — orders over $400, multi-box shipments, and some vendor items may incur return shipping charges. Full policy
Questions
Frequently asked questions
Shipping
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We default to UPS Ground or USPS Ground Advantage. Select an expedited option at checkout and we'll use the appropriate carrier for that service.
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Returns & Cancellations
Email help@happyhydro.com within 30 days of delivery and we'll get you a refund or replacement, your choice. Items must be in original packaging with all parts in resalable condition. Multi-light orders, grow tents, orders over $500, and multi-box shipments may incur return shipping charges. AK, HI, and international buyers are responsible for return and warranty shipping. Some vendor-specific policies may apply — check the product page for details.
Refunds are processed through Shopify within 10 business days. Most customers see the credit back in about 5 days.
Reply to your order confirmation email or email help@happyhydro.com as soon as possible. Canceled orders may incur a processing fee depending on your payment method:
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Call or chat with our grower support team at 716-217-0353, Monday-Friday 10 am-4 pm EST. You can also email help@happyhydro.com any time and we'll get back to you quickly.
Your privacy matters to us. Read our full policy at happyhydro.com/pages/privacy-policy.
Why Buy From Happy Hydro

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

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