How to Fill:

Use a good soilless mix with peat, vermiculite and perlite.  It should include a wetting agent and starter charge.  It's easier if the mix is slightly moist (not wet) when you fill.  We recommend ASB Greenworld's VPW30. 

Some growers mix in a little slow-release fertilizer and or polymer agents for moisture.  We don't offer advice on these products and recommend you experiment a little before you do this on a large scale.