Do concrete blocks go bad?

Do concrete blocks go bad?

Some of the solid concrete blocks are crumbling away to nothing while others adjacent to them appear to be in perfect condition. The cap blocks at the top of the wall are showing the worst deterioration. These blocks are less than 15 years old and the builder assured me they'd last at least 100 years.

Do concrete blocks leach into soil?

Some concrete blocks contain fly ash, which is a byproduct of burning coal. This means that the blocks could contain heavy metals and other hazardous waste materials. Concrete blocks can also contain lime, which might leach into the soil when you water your plants, but this is not thought to be harmful to humans.

What are concrete blocks made of?

Concrete blocks are made from cast concrete (e.g. Portland cement and aggregate, usually sand and fine gravel, for high-density blocks). Lower density blocks may use industrial wastes, such as fly ash or bottom ash, as an aggregate.

Can you put a planter box on concrete?

The Royal Horticultural Society recommends laying at least three inches of coarse gravel or stones covered with a geotextile membrane beneath a raised bed built over concrete or pavement. The membrane prevents the drainage material from clogging and getting mixed up with your soil.

Do planter boxes need drainage?

A wooden box may need drainage holes, depending on how porous it is without them. Water that stands for too long in a planter will drown plants by choking out the oxygen supply to the roots, so good drainage is essential.

Should I put holes in bottom of planter?

Holes in the bottom of the planter are essential for proper drainage. The holes give the excess water an escape route so it doesn't stay in the soil. Many flower pots come with only one drainage hole. ... If the container is made from a material you can drill, add two or three more drainage holes.

Do you need to put holes in the bottom of planters?

A hole at the bottom of the container is critical. It allows water in the soil to drain freely so adequate air is available for the roots. While various kinds of plants have differing drainage needs, few can tolerate sitting in stagnate water.