What tide is the strongest?

spring tide

at new moon or full moon, the tide's range is at its maximum. This is the spring tide: the highest (and lowest) tide.

Canada

I did research on the strongest tides and I found this. Good it helps.

Lichens are not parasitic when they grow on trees, they just use the tree bark as a home. They enrich the soil by trapping water, dust and silt. When lichens die they contribute organic matter to the soil, improving the soil so that other plants can grow there.