*We use cell cast acrylic. Cell cast acrylic is highly resistant to weather conditions and can withstand exposure to blazing sun and extreme cold. Although, we do recommend that you bring in your acrylic marker in the off season to increase longevity and so you don't lose them in the snow and winter weather. ;)
**Do not leave baltic birch markers out for the winter. These are a softer plywood and are ideal for one season use. They are not sealed, but if you would like to increase the longevity you can seal on your own. Always read sealer labels to ensure no toxins will be introduced into your garden.