|
 
Perlite
Perlite is a
volcanic rock that has been superheated into very lightweight expanded glass
pebbles. It is used loose or in plastic sleeves immersed in the water. It is
also used in potting soil mixes to decrease soil density. Perlite has similar
properties and uses to vermiculite but generally
holds more air and less water. If not contained, it can float if flood and drain
feeding is used.
It can
be used alone as growing medium, but doesn't provide enough anchorage
for large plants. Perlite is often used to start seed and cuttings,
which can be easily transplanted after rooting.
| Product
|
Size |
Price
|
|
| Vermiculite |
10
litre bag |
£ 3.00 |
 |
| Vermiculite |
100
litre bag |
£ 14.50 |
|
Vermiculite
Like perlite, vermiculite is another
mineral that has been superheated until it has expanded into light pebbles.
Vermiculite holds more water than perlite and has a natural "wicking" property
that can draw water and nutrients in a passive hydroponic system. If too much
water and not enough air surrounds the plants roots, it's possible to gradually
lower the medium's water-retention capability by mixing in increasing quantities
of perlite. |
