Most cultivars of elderberry will not grow through seed but the non-hybrid varieties will grow through seed. According to some gardeners, elderberries cross-pollinate with any other elderberry bushes growing within sixty feet, making the risk of gathering accidentally hybridized seeds very high. Some of the species like the blue elderberry (Sambucus nigra subsp. cerulea) grow through from seed and they are suited to gardens in a wide range of climates within USDA plant hardiness zones four to nine. The seeds will really germinate reliably if they are cold-stratified and started under the right conditions. The process really requires patience because the stratification process can take a lot time. To read more visit https://growplantseed.com/how-to-grow-elderberries-from-seed/