| The term "aggregates"
refers to the non-organic growing media such as Lava Rock or gravel. For convenience, we include expanded mineral products such as Aliflor and Solite. Like other potting media, these materials are available graded
by size with the smaller sizes being used for seedlings and miniatures
and the larger sizes being used for specimen plants and large pots. The
larger sizes are also useful as drainage for other potting media. Being
inorganic, these materials do not break down and are ideally suited
for warm climates and outdoor growing in rainy areas.
Aggregates are easy to use - the uniform pieces readily fall into place among the orchid roots. Keep in mind that large pots tend to get heavy, especially if the pot is clay. Although Solite is reported to hold up to 30% of its weight in water these materials generally require more frequent watering than organic media. As with other media, additives such as sphagnum may be used to modify the moisture holding properties. Aggregates provide excellent drainage and aeration to orchid root systems and will last indefinitely. Although they can be re-used, this is not advisable unless the used media can be sterilized in a kiln. Complete nutrition must be supplied when potting with aggregates; use a balanced fertilizer such as 20-20-20. It is also recommended to thoroughly flush potted orchids with clean water monthly to avoid fertilizer salts from building up. Many growers like to pre-rinse their medium prior to using in order to remove dust and fine debris.
Aliflor on the left and Lava Rock on the right |
