there are several projects on Cystoseira restoration in the Mediterranean Sea. Some of them included also the cultivation stage. You might be interested in MERCES-project (www.merces-project.eu) and ROC-POP-Life project from Annalisa Falace Lab https://www.researchgate.net/project/Promoting-biodiversity-enhancement-by-Restoration-Of-Cystoseira-POPulations-ROC-POP-Life