One of the primary uses of black annealed wire in agriculture and gardening is for supporting plant growth. Farmers and gardeners often use this wire to tie plants to stakes or trellises, ensuring that they grow upright and receive adequate sunlight. For instance, in vineyards, back annealed wire is essential for training grapevines along trellises. This not only helps in maximizing exposure to sunlight but also improves air circulation around the vines, reducing the risk of fungal infections and other diseases.