Is cardboard a good filler for planters?
After a few months, you’ll start to see the cardboard breaking down. Underneath, you’ll find fresh garden soil, ready for plants. The best time to do this is in fall, so the cardboard can break down over the winter and you’ll be ready to go in spring. Cardboard can break down in the garden within two to six months if the conditions are moist. Warmer weather and using thinner cardboard can speed up this process.The cardboard will decompose over time, which means that as it breaks down, it encourages the roots of your plants to grow through it, further preventing weeds from emerging.Priming Cardboard For Sheet Mulching If cardboard is able to dry out, it’s going to take a lot longer to disappear into the soil. However, in a wetter climate like mine, cardboard can rot down under mulch within just six months or so.
What is best to put in the bottom of a planter for drainage?
Layer the bottom of your planter with materials such as gravel, pebbles, or specialized drainage mesh. This creates a barrier that prevents soil from blocking drainage holes and allows water to flow freely to the base. Adding this layer is particularly important for heavy or compact soils that retain more water. An effective and affordable way of reducing the soil you need when filling large planters is by using lightweight pot fillers and lightening materials. These materials consist of foam peanuts, plastic bottles, and even crushed cans.
What to use instead of rocks at the bottom of a planter?
Adding rocks can actually trap water, harm your plants’ roots, and even damage your container over time. So, what really belongs in the bottom of your planter? High-quality potting soil—nothing else. I fill large pots half full with empty plastic water bottles, tightly capped. As far as roots are concerned, bottles are the same as rocks. Yet empty plastic water bottles don’t weigh anything. Some soil does fall into gaps, so it’s a good idea to pour pumice into the pot prior to adding potting soil.Adding rocks can actually trap water, harm your plants’ roots, and even damage your container over time. So, what really belongs in the bottom of your planter? High-quality potting soil—nothing else.