Can anyone tell me what you should feed a tree fern with,it is growing in an oak barrel.
Feed continuously with liquid seaweed extract added to the daily watering.
I have a bucket /bin in which I put water and all my fern leaves . I leave it for a few weeks till it has turned a very nice brown colour and I have been using that as a feed for the last few years and my tree fern seems to be doing well. I use a watering can spray most evenings.