I’ve never seen an advantage from lining planters with plastic or metal; it only traps moisture against the wood. Coatings can extend the life of a planter but some fear contamination from the breakdown of some paints and coatings. I’m not sure there is a real risk. The safest coating seems to be boiled linseed oil.
In a cold climate an untreated pine planter may last many years. In a warm climate where termites are active, the planter may be in poor shape the second year, whether coated or not.
Poured concrete planters are a bit more work, but they last forever.
In a cold climate an untreated pine planter may last many years. In a warm climate where termites are active, the planter may be in poor shape the second year, whether coated or not.
Poured concrete planters are a bit more work, but they last forever.
