Hi, Is it possible to use F,B and Bone to enrich multipurpose ocmpost for final pot planting of greenhouse tomatoes. It would work out cheaper than chempack potting compost additive.
Wouldn't do it, MJ. BF&B added this way would result in too much lush growth at the expense of setting fruit.
There is sufficient feed in your MPC to last until they need feeding proper with a weekly high potash feed.......this should start when the first truss of flowers has set fruit.
Would wood ash be good enough, I wonder?