Nope but its a gorilla grow and it has heaps of leaf litter and decomposing stuff in the native soil.
Here's some info on humic acid it it's cheap and the plants love it. well worth putting some in the holes.
"Leonardite is not a fertilizer. It acts as a conditioner for the soil and as a bio-catalyst and bio-stimulant
for the plant. Humic acids are an excellent natural and organic way to provide plants and soil with a
concentrated dose of essential nutrients, vitamins and trace elements. Compared to other organic
products, Leonardite enhances plant growth (biomass production) and fertility of the soil. Another
advantage of Leonardite is its long-term effectiveness, as it does not get consumed as quickly as
animal manure, compost or peat. Leonardite decomposes completely, therefore it does not enter
into nutritional competition with plants for nutrients like nitrogen. This is not the case with partially
decomposed compost, whereby the organic substances in soil are rapidly consumed by micro-
organisms and mineralized entirely without humus formation.
Humic acids chelate nutrient compounds, especially iron, in the soil to a form suitable for plant
utilization. Thus, the nutrient supply of plants is optimized. Increases up to 70% in yield, accompanied
by a reduction up to 30% in the use of fertilizers and pesticides, as well as better and healthier growth
of green grass, ornamentals, agricultural crops and woods can be attained with the regular application
of first-quality humic acids. Furthermore, water holding capacity of soils is increased considerable,
which means that the use of water can be reduced substantially."