Why do the roots of some orchids grow on the ground? _ Family growing flowers

Orchids raised at home will occasionally find roots growing out, which not only affects the appearance, but also worries about unhealthy growth of orchids, so some flower friends want to call for reasons:

orchid root

There are two main reasons why the roots of orchids arch above the ground

I. The orchid basin is small and cannot accommodate it. If the basin has not been changed for three years;

II. Long drought water shortage, basin soil is too full, water overflow, basin soil in a long-term state of water shortage, can use a suitable high tube orchid basin, replace the planting soil, watering must be poured to the bottom hole water.