Plant Magic Oldtimer Granules — Mycorrhizal Root Inoculant with 20+ Beneficial Bacteria Strains
Best for: Growers wanting to supercharge root development and nutrient uptake without chemical stimulants
Our thoughts
This is a proper root inoculant that delivers consistent results. Plant Magic's multi-microbial approach — mycorrhizal fungi plus 20+ bacterial strains — gives you a living soil ecosystem without the faffing about. Apply once at potting and let the microbes do the work. One we recommend a lot for propagation and organic growers.
Plant Magic Oldtimer Granules is a granular mycorrhizal inoculant packed with endomycorrhizal fungi (Glomus species), Trichoderma, Bacillus, Pseudomonas, and over 20 strains of beneficial bacteria. Sprinkle it into your potting hole at planting time and the microbes colonise the root zone, unlocking nutrients your plants can't normally access, thickening feeder roots, and building disease resistance. It works in both soil and coco, though soil is where it shines.
How it compares
Plant Magic sits in the mid-market sweet spot of mycorrhizal inoculants.
- Multi-strain formula (20+ bacteria + mycorrhizae + Trichoderma) vs. single-species competitors
- Granular format beats powders for potting operations — less mess, easier application
- UK-manufactured with years of proven grower results behind it
- Lower cost than ultra-concentrated premium brands like Dynomyco or Trifecta, without compromising real-world performance
You're not paying for a branded premium. You're getting a multi-microbial ecosystem that actually works.
Usage guidance
Oldtimer Granules are applied dry, directly into your growing medium at potting time. The granules need to make direct contact with roots to colonise effectively.
Potting up seedlings and cuttings
Use approximately 20g per 10 litre pot (roughly 1 tablespoon). Sprinkle the granules into and around the potting hole so the roots make immediate contact as they begin to develop. This is where Oldtimer Granules shine — root colonisation happens fast, which means dramatically faster establishment.
Soil-based growing
Work the granules evenly through your potting mix or apply at potting time as above. The microbes establish a living relationship with roots over 2-3 weeks. You'll see thicker root development and improved nutrient availability.
Coco-based growing
Works effectively in coco peat as well as soil, though performance is best in soil-based systems where the microbial ecosystem is more stable.
Important compatibility note
Do not use peroxide products (hydrogen peroxide additives, some root treatments) — they'll kill or inhibit the beneficial microbes. Keep your root zone chlorine-free too; if you're on mains tap water, a dechlorinator helps the microbes thrive.
Technical specifications
- Product type: Granular mycorrhizal inoculant
- Available sizes: 500g and 1kg pouches
- Microbial composition: Endomycorrhiza Glomus, Trichoderma species, Bacillus, Pseudomonas, plus 20+ beneficial bacterial strains
- Application rate: 20g per 10 litre pot (approximately 1 tablespoon)
- Application method: Sprinkle dry into potting hole or mix through growing medium
- Medium compatibility: Soil and coco peat (soil preferred)
- Best results: Organic growing systems; avoid peroxide products
Who this is for
- Propagators and seedling growers wanting faster root establishment
- Organic growers building living soil ecosystems
- Anyone wanting to reduce chemical inputs and work with microbial symbiosis instead
- Growers running soil-based systems where microbial populations matter
- Budget-conscious growers wanting proven root inoculant without premium pricing
Particularly well suited to anyone doing a lot of potting-up operations where consistency and ease of application matter — one application per pot, zero mixing, zero guesswork.
Our take
Plant Magic Oldtimer Granules does what a proper root inoculant should do: it colonises the root zone, unlocks locked nutrients, and builds a living soil ecosystem. The multi-strain approach means you're not betting on one microbial species — you've got 20+ working together. And it's been delivering good, consistent results for years.
If you're propagating, potting up regularly, or building an organic system, this is one worth picking up while clearance stock lasts. Apply once, let the microbes work, and watch root development improve visibly.
