What is a soilless potting mix?

A growing medium made entirely from non-soil ingredients like peat moss, coconut coir, perlite, pumice, bark, and charcoal. Despite the name, it provides everything a plant's roots need: anchorage, water retention, drainage, and air.

How is soilless mix different from regular potting soil?

Soilless mix contains no actual soil. Regular potting soil is mostly sterilized garden soil with amendments. Soilless mixes drain better, weigh less, are pathogen-free, and can be tuned to specific plant types.

Can I use soilless mix straight from the bag?

Yes for most plants. For cacti and succulents, you may want to add extra perlite or pumice for additional drainage. For orchids, choose a bark-specific mix rather than a standard soilless blend.

Do plants need fertilizer in soilless mix?

Yes. Soilless mixes have minimal nutrients of their own, so regular fertilizing is essential. Use a balanced houseplant fertilizer at half-strength every 4-6 weeks in the growing season.

How long does soilless mix last?

12-18 months for most mixes. The organic components (peat, coir, bark) gradually break down, reducing aeration and drainage. Repot annually with fresh mix to keep plants thriving.

Soil-less Potting Mix 101

January 12, 2024

Soilless mix cost in Canada. A 5-quart bag of premium soilless mix from a Canadian retailer or veryplants.ca typically runs CAD $22-28, vs roughly USD $18-22 (CAD $24-30) for the same volume shipped from a US site. The price gap is narrower than most imported goods because veryplants.ca fulfills from a Canadian warehouse, skipping the cross-border duty and brokerage that adds 20-35% to most US-origin gardening products. Direct ordering from veryplants.ca makes the most sense when you're buying multiple bags (free shipping kicks in at CAD $100) or want a specific size not yet stocked in retail. If you're after a single 5-quart bag, our Canadian retail partners often price below the direct-site price because they don't pass through shipping.

Why soilless mix matters more in Canada than in the US. Canadian growing conditions amplify the case for soilless mix. The shorter outdoor season (May through September in most populated zones) means your indoor potted collection IS the year-round garden for many Canadian growers, so substrate quality compounds across more months than it does for southern US gardeners. Indoor heating season runs 5-6 months in southern Canada and longer further north, which means substrate compaction, hydrophobic peat, and pest carryover all show up faster than they would in milder climates. A soilless mix that stays structurally stable for 12-18 months is meaningfully different from one that compacts in 6.

CFIA labelling and what to look for on Canadian-sold soilless mixes. Canadian Food Inspection Agency rules require all packaged plant substrates sold in Canada to disclose origin, processing, and ingredient breakdown on the bag. Look for: (1) "Made in Canada" or "Packaged in Canada" — confirms no border-treatment sterilization, (2) named primary components (sphagnum peat, coco coir, perlite, pine or fir bark) rather than vague "growing media," (3) batch or lot code so you can trace if there's an issue. Mixes sold on veryplants.ca carry all three because the brand controls bag-printing in Canada. Imported US-brand mixes sometimes lose the lot code at the retail relabel step, making traceability harder if you hit a quality issue.

Soil-less Potting Mix 101

While all plants share common needs regarding their potting medium, such as proper air circulation and drainage, there are numerous options in terms of mix composition. Whether you choose Molly’s Potting Mixes or create your own recipes at home, consider the following guidelines:

The mix should have a good balance of large, medium, and smaller particles to ensure proper air circulation and drainage after watering.
Hard materials will decompose at a slower rate than soft ones, reducing compaction which could restrict root growth and health.
A mix of organic and inorganic (mineral) materials will help mimic the plant’s natural growing environment.
Popular ingredients include tree bark, sphagnum (less sustainable) or coco (more sustainable) peat, perlite, sand, vermiculite, rocks, and other organic and inorganic ingredients.
Soil-free ingredients reduce the likelihood of disease, pests, and soil-borne pathogens.
Make sure to test for pH levels and target a value around 6.0 to maximize the plant’s ability to absorb nutrients
Check with the manufacturer/store you buy your potting mix from to find out how often you should re-pot your plants using fresh mix.

💚 Pro-tip: Many people confuse potting mixes with fertilizers. Potting mixes are simply a reference to the medium in which plants are growing (e.g. soil, soilless, hydroponic) while fertilizers contain a mix of macro (e.g. nitrogen, phosphorous, potassium) and micro (e.g. copper, iron, manganese) nutrients that plants need. Potting mixes, excluding any organic ingredients they may contain, usually have minimal nutrients so adding a fertilizer is a necessary step to ensure plant health.