Semi-hydro mineral mix 8.5 L
Inorganic substrate of pumice, zeolite and lava rock. It does not break down or compact.
No organic component at all: pumice, zeolite and lava rock, 5–16 mm. It does not rot, does not compact and does not change structure over time — so water and nutrients are decided by you, and not by a substrate quietly degrading underneath.
It is the choice for semi-hydro, for self-watering pots, and for the plants you keep losing to overwatering. It also removes part of the pest problem: in an inert medium there is no decomposing organic matter, so no fungus gnats and far less risk of root disease.
The trade-off is that it holds no nutrition whatsoever. In a mineral mix, fertiliser is not a seasonal addition: it is the only source the plant has, and it goes in at every top-up.
Sizes and prices
- Fine 2–8 mm · 8.5 L — €19.95
- Coarse 8–16 mm · 8.5 L — €19.95
Specifications
- Composition
- Pumice, zeolite and lava rock
- Grade
- 5–16 mm
- Fine
- 2–8 mm, for small pots and rooting
- Coarse
- 8–16 mm, for large pots and semi-hydro
- Organic content
- None: it does not break down or compact
- Nutrients
- None: fertiliser is compulsory
- Volume
- Resealable 8.5-litre bag
- Suitable for
- Semi-hydro, self-watering pots, plants prone to rot
How to use it
Rinse before use to wash off the dust. Use it on its own in semi-hydro, or mixed with organic components for a blend of your own. In a self-watering pot, keep the reservoir in play and dilute feed at every top-up.
Used with
- Self-watering aroid pot — Ø 15 × 15.5 cm €3.45
- Self-watering wick — 60 cm · Ø 6 mm €2.05
- HESI Hydro Growth 1 L — 1 L €14.95
- Graduated pipette — 2 ml €0.45
Part of
- First plant kit · semi-hydro — €35.96