Each year I have tried different organic potting composts but I end up with a lot of green algae/mould on the surface of the pots/seed trays in the greenhouse (sometimes just a few days after sowing) and some seedlings get choked and rot away.
I am quite careful with the watering but it does not seem to be down to this. I want to continue using organic compost if possible. Does anyone have any ideas about how I can prevent this mould developing?
Hi Godfreyrob, place some sharp sand into your compost mix, and place sharp sand or vermiculite on the top of your compost after you sow your seeds, this acts as a mulch and helps with dranage.
to much water and stale air i use kids play sand as a mix and top coate and open the window a bit this should sort it for you ;)
we only water from the bottom and keep most things on the dry side :)
If you're getting green algae, then you're over-watering, and possibly not enough light. It's the same stuff you get in ponds and on shady patios.
Always water your pots from the bottom, by standing them in a tray of water. The plant will take up just what it needs.