Yes, liquid seaweed extract can be used as a supplement for Plumeria. Seaweed extract contains a range of trace elements, amino acids, and growth-promoting substances that can enhance plant health and stimulate growth. It can be used as a foliar spray or soil drench to provide additional nutrients and improve the plant’s overall vigor. Seaweed extract is especially beneficial during periods of stress or when the plant requires a nutrient boost. When using liquid seaweed extract, follow the manufacturer’s instructions for the appropriate dilution and application frequency.