Anthropogenic activities increase concentration of heavy metals in the environment to amounts that are harmful to plants, animals, and humans. Passing through food chains, these metals can affect biological functions, reduce plant yields, lead to food insecurity, accumulate in organs, even causing diseases such as cancer. The objective of this study was to determine optimal Super-Accumulator-Biopolymer from agro-wastes to reduce bioavailability of heavy metals and improve plant growth. It was predicted that if Super-Accumulator-Biopolymer (SAB) is made from carrageenan, chitosan, crosslinked-chitosan, and crosslinked-carrageenan and applied in hydroponics plant growth system for reducing heavy metals (HM), crosslinked chitosan SAB will be most effective, with 50% reduction in HM bioavailability and 25% improvement in promoting plant growth attributed to its highest bio-adsorption capacity. To study this, BioShields (Super-Accumulator-Biopolymers) were made from chitosan, carrageenan and two variations by crosslinking them with citric acid. Heavy metal aqueous solutions were passed through these BioShields. Three tests conducted were Bioavailability in Filtered Aqueous Solution (medium), Bioavailability in Plant Biomass, and Plant Growth Measurement. The results confirmed that hypothesis was partially correct; Across all tests, Crosslinked-Chitosan- Based-BioShield demonstrated highest efficacy. All variations of BioShields proved effective in exceeding 50% goal of bioavailability reduction and 25% goal of plant growth improvement. A few anomalies were associated with results of Carrageenan-Based-BioShield, but nevertheless, it proved viable when cross-linked with Citric Acid. Overall, BioShields are an effective solution, consistently yielding better results than direct exposure to HMs due to polymer networks, active binding sites, and biologically adhesive properties.