Can I use this in potted plants?

That's all I use it on. I've used it for years and it's been great. I use it when I get plants from wherever ( nursery, Lowes, Home Depot, etc.) and want to put them into pots. I use the Bio-Tone starter to be sure they get good root growth and to make sure the transfer from little nursery containers to a bigger pot are successful.

I used this for the first time last night. It smelled like organic fertilizer. Today, I went to use it and it smells like ammonia. Is this OK?

Organic fertilizers can sometimes continue to compost if kept in a very warm place. The nitrogen heats it up further causing the ammonia smell. If the bag doesn't feel too warm, this is not a big deal, but I recommend you store it in a cool place to maintain the natural N-P-K balance and micro-organism makeup.

Can this be used in a potting mix (vermiculite and coconut choir) for starting seeds? Or will it cause burn?

Yes, definitely use it for potting mix- it promotes root growth like nothing I've ever used before and the strong odor comes from the mycorrhizae fungus- not from anything that would burn the seeds.

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Espoma Organic Bio-Tone Starter Plus 4-3-3 Natural & Organic Starter Plant Food with Both Endo & Ecto Mycorrhizae; 4 lb. Bag; The Ultimate Starter Fertilizer - Pack of 1

Espoma Organic Bio-Tone Starter Plus 4-3-3 Natural & Organic Starter Plant Food with Both Endo & Ecto Mycorrhizae; 4 lb. Bag; The Ultimate Starter Fertilizer - Pack of 1

Product ID: 1180982

Details

Brand
Espoma
Item Form
Granules
Item Weight
4 pounds
Liquid Volume
4 liters
Specific Uses For Product
Gardening

🌱4-3-3 NPK ratio for balanced growth

🦠Dual endo & ecto mycorrhizae for root vitality

🇺🇸Made in USA with organic certification

€ 66.73

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Description

🌿 Grow smarter, not harder — the organic edge your garden deserves!

TRUSTED HERITAGE - From Espoma, a leader in natural organics since 1929, ensuring quality and reliability.
SYMBIOTIC ROOT POWER - Enhanced with both endo & ecto mycorrhizae to supercharge root development and nutrient uptake.
ORGANIC ECO FRIENDLY - Certified organic and free from toxic chemicals—safe for your garden and the planet.
BALANCED NUTRIENT BOOST - Optimized 4-3-3 formula fuels seedlings and transplants for vigorous growth.
READY TO USE CONVENIENCE - No mixing required—just blend with soil at planting for instant root zone activation.

Espoma Organic Bio-Tone Starter Plus is a premium 4 lb. organic fertilizer with a balanced 4-3-3 NPK ratio, enriched with both endo and ecto mycorrhizae to enhance root health and nutrient absorption. Perfect for all plants during planting or transplanting, it’s ready to use and certified for organic gardening. Made in the USA by Espoma, a trusted name in natural organics since 1929.

Specifications

ASIN	B000J3AG2K
Best Sellers Rank	#8,779 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #275 in Garden Fertilizers #357 in Plants, Seeds & Bulbs
Brand	Espoma
Brand Name	Espoma
Coverage	Medium
Customer Reviews	4.8 out of 5 stars 2,557 Reviews
Global Trade Identification Number	00050197038041, 00077349922027, 00885351226336
Included Components	Grass Seed, Plant Fertilizer
Item Form	Granules
Item Type Name	OUTDOOR RECREATION PRODUCT
Item Weight	4 pounds
Liquid Volume	4 liters
Manufacturer	Espoma
Mixing Ratio	9 pounds per cubic yard or 1 cup per cubic foot
Model Number	ESPOMA - BTSP4
Number of Items	1
Number of Packs	1
Part Number	ESPOMA - BTSP4
Specific Uses For Product	Gardening
Target Species	plants
UPC	077349922027 617407746358 050197038041 885351226336 050197035101
Warranty Description	Warranty

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€ 66.73

Duties & taxes included

In stock

Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Portugal.

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Join PRO →

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TrustScore 4.5 | 7,300+ reviews

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