The additional £200,000 it has ploughed in will allow P2F to open a new manufacturing facility in Nottingham and to expand its sales team.
P2F has developed a nano-particle technology that enables plants to grow more quickly. It can be used indoor and outdoor and alongside existing fertilisers on high nutrition crops such as chickpeas.
"The interest shown in P2F products and technology since we acquired our original investment has significantly exceeded our expectations,” said Braveheart chief executive Trevor Brown.
“As a result, we have decided to step up our investment immediately, thereby providing P2F the funds necessary to accelerate its business plan."
Braveheart holds six strategic investments in its portfolio. These include biotechnology firm Kirkstall, UV light detection group Paraytec, propeller and rotating shaft monitoring group Gyrometric Systems, microscope imaging firm PhaseFocus and Sentinel Medical, a spin-out of Paraytec developing technology to detect cancer cells in urine.