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© Bad Hare Gardening, LLC, DBA Fifth Season Gardening, 2026
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Curbside Pick Up, Nursery, Garden Center
© Bad Hare Gardening, LLC, DBA Fifth Season Gardening, 2026
Sitemap | Privacy Policy | Site by
HC Williams says
Interested in trying this product on Giant Watermelons. Please send information.
ashley says
What info are you looking for, specifically? Here’s the Mammoth P website for more general info, but let us know if there’s something particular we might be able to help with.
Paul says
For the application rates, should I use Mammoth P with every watering or just once a week at the .6ml rate? I’m growing in soil, indoors.
ashley says
Once a week should do the trick. Cheers!
tom smith says
Is Mammoth P good to use in germinating my seeds ?
ashley says
Hi Tom, we’d actually recommend Roots Organics Oregonism XL for seeding, as it has lots of endo/ectomycorrhizal beneficial bacteria and trichoderma. Mammoth P is great for when your plants are larger and you are looking to increase plant yields.
sean says
will mammoth p buffer ph or do i need to ph my water to 6.5 then add mammoth p?
ashley says
Hi Sean,
We add all nutrients and supplements first and then test/adjust our pH levels as necessary.
Mark D Rissi says
So I add my full mix, nutes, additives ect then ph my mix to need ph then add mammoth p.
ashley says
We recommend adjusting the pH after everything else is added (including Mammoth P), because the pH could be altered as you add nutrients.
Jillian Nacci says
How do you use the oregonism for seeding?
Anthony Negri says
Looking to try MAMMOTH P!
ashley says
Hi Jillian,
You can either sprinkle a small amount into the hole when seeding, or you can just mix in 1 tsp per gallon and wet your soil with the mix to become inoculated. Cheers!
Gary says
If you are already using mycorrhizae, how fast does mammoth p start working or does it need acclimation? Thank you.
ashley says
Hi Gary,
Mammoth p is actually different microbes than any other on the market. They want you to use it from the beginning of veg through flower, but as long as you start using it by week 2 of flower, it will start working by the time your plants really need it. Cheers!
Tracy says
Is Mammoth P test or otherwise known to be beneficial to turf grass? If so, is the 1 tsp. per gallon mix rate still sufficient?
ashley says
Hi Tracy,
Absolutely it’s beneficial to turf grass. The microbes will increase nutrient uptake and increase the thickness of the turf. — Ryan at Fifth Season Gardening
Adam says
Iv only just heard about mammoth p,
My plants are in the first week of veg. Is there any point adding mammoth now? Or is it too late?
brian says
That’s a great question. Here is information from the Manufacturer’s page: “MAMMOTH P is specifically designed to increase phosphorus availability during the bloom phase and should be used as a supplement to your regular fertilization program. Application during clone and vegetative phase will boost effectiveness.” Good to go!
JESSE T MOORE says
Am I really supposed to use only .6 ml per gallon? That just seems like a crazy small amount? Or is it 6 ml per gallon?
brian says
Thanks for your question. It really is 0.6 mL/gallon. A pipette or syringe makes this easy to do. Best of luck.
Wade says
If I don’t use up my Mammoth P product within the first six months should I just throw it away?
brian says
Assuming that it was within date when opened, and stored in room temp conditions, per the manufacturer you have 1 year to use the contents. Best of luck!