Home Depot, UnitedHealth Group, and NextEra Energy check off a lot of important boxes for investors seeking safe and growing dividend income.Dividend income can be extremely valuable for long-term investors as it can help pad your overall returns from a stock. Simply chasing high-yielding stocks, however, isn't necessarily the best or safest idea, as those payouts aren't always sustainable.Instead, a good combination can be to focus on safe dividend stocks with above-average yields that have also been growi ...