U.S. seaweed farming has the potential to become a significant contributor to seafood production, but the industry is still in its infancy and faces regulatory challenges in developing offshore farms. Land-based aquaculture has the potential to augment seaweed farming and mitigate some of the barriers faced by farmers. In order to expand the land-based seaweed aquaculture industry, there is a need for more low-cost and scalable methods of seaweed production. Our goal is to create novel and accessible hatchery technologies which will reliably produce high density, homogenous macroalgae biomass for use in tumble culture. We have developed an affordable and modular system called the Core-Lit Apparatus for Seaweed Hatcheries (CLASH). Bull kelp (Nereocystis luetkeana) and giant kelp (Macrocystis pyrifera) have been successfully cultured in the CLASH system. Additional studies seek to determine ideal stocking densities, nutrient supplementation, and light exposure for maximizing productivity. The future of the project aims to introduce new commercially relevant species for aquaculture, create new seaweed strains for land-based farming, utilize CLASH grown kelp for restoration projects, and scale up the use by the industry. This simple, user-friendly, low-cost device has proven to be a promising hatchery tool which could increase the diversity, efficiency, and yields of land-based seaweed farms.