Our seed tapes streamline and simplify planting. Enhance mealtimes with Seed Tape - Rainbow Chard! These are combinations of flavour and colour that everyone at the dinner table will love, including the youngsters! When grown in a glasshouse or polytunnel, rainbow chard can continue to produce healthy leaves and vibrant stems until the first hard frosts outside. Alternatively, it can crop all winter long. 6m seed tape.