Adjusting watering schedule in greenhouse

[Ray]

Water is not the issue. Water held by surface tensionin the open spaces in the medium is the issue, as that suffocates the roots and kills them. Having a more open medium with larger voids so the interstitial water is minimized is the key.

Many growers in Florida use LECA precisely for those reasons, plus it absorbs water really well, keeping the root system moist even when the pellets appear dry.