Pro-Mix HP Growing Medium
Best high drainage substrate for serious indoor gardeners.
A high-porosity, peat-based medium designed for superior drainage and aeration. It excels at seed starting and propagation, using natural fungal additives to boost root health and stress resistance.
$29.99
at
Greenhouse Megastore
More PRO-MIX HP options
Who it's for
- Indoor gardeners prone to overwatering their container plants
- Growers seeking stronger plant growth and improved nutrient absorption
- Serious cultivators who prefer managing their own liquid nutrient programs
Who should skip it
- Low-maintenance gardeners looking for a just add water soil
- Beginners who do not own water testing or buffering equipment
- Budget-conscious hobbyists working with large-scale outdoor garden beds
Performance breakdown
Drainage Efficiency
High perlite content ensures water flows freely, preventing root rot issues.
Root Development Support
Mycorrhizae additives actively boost root system expansion and nutrient uptake efficiency.
Aeration Quality
The airy, porous structure provides essential oxygen access for delicate seedlings.
Propagation Suitability
Perfectly balanced texture makes this the gold standard for starting cuttings.
Moisture Retention
Peat base holds enough water to sustain growth without becoming soggy.
Transplant Resilience
Fungal additives significantly reduce shock when moving plants to new pots.
Key Specs
Volume
2.8 cu. ft.
Ingredients
Canadian sphagnum peat moss, perlite, limestone, wetting agents, Mycorrhizae
Drainage
High
Aeration
High
Beneficial Microbes
Yes
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