ProMix is a high-quality plant growing medium. The ProMix soil line is known for offering a variety of potting mix options, some of which are listed as safe for organic growing. The ProMix HP adds air and bulk to my large planters and raised beds, and also works well for microgreens indoors.Click to see full answer. People also ask, does promix HP have nutrients?CHEMICAL CHARACTERISTICS: PRO-MIX® HP MYCORRHIZAE™ contains a balanced nutrient charge to promote initial plant development. During the course of crop production, it is necessary to initiate a fertilization program. The program selected should consider water nutrient content, crop type and stage of plant development.Secondly, what is in pro mix HP? PRO-MIX HP MYCORRHIZAE, a high porosity peat-based professional growing medium with its high perlite content, provides a growing environment which benefits gardeners looking for significant drainage capacity, increased air porosity and lower water retention. One may also ask, is promix HP soilless? CHILKaT. Promix HP is mainly peat moss, if you’re planning on running soilless drain to waste with straight Promix HP I’ve found the ph to fall between 4.8-5.5, usually it’s at 5.5 right out of the bag, even though their specs say 5.5-6.5 I’ve never had a bale over 5.5.What is the pH of promix HP?For most greenhouse crops, the ideal growing medium pH for maximum nutrient availability is between 5.5 and 6.5. Why? Because in soiless mixes, micronutrients are very minimal. You tend to want to see the pH lower, so that’s where the ideal pH of 5.5 to 6.0’s is best.

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