It depends on a lot of factors like soil type, site, slope, rainfall, and surrounding vegetation of the particular location. In Central Virginia, we have had field tests on road medians and in parks since June 2013 where we never watered the trees after the first day. There were drought periods where there was only 0.25” rain at the site over a time period of 7 weeks.
We monitored the soil moisture, which is the best indicator of whether tree needs watering or not. In our case studies in central Virginia, the soil moisture has never reached a below 3 (on a scale of 1-10 with 1 being bone-dry and 10 be soaking wet), so we never need to water them. In this case study
, we recorded soil moisture for a long period of time. In another case study
, we looked at the signs of stress during a 5-week drought.
We understand there are many water prescriptions across the continent telling people how many gallons of water per day. We discussed this with Professor Gilman (University of Florida), whose work is the mostly cited by these water prescriptions. The water prescriptions do not take account of evaporation, runoff, weed competition and other losses that reduce watering efficiency. TreeDiaper®
technology offers much higher watering efficiency by reducing runoff, evaporation and weeds.
For western US, customers who worry about watering amount in TreeDiaper®
may choose larger sizes or place more than one units around each tree to ensure there is enough water and reduce the frequency of watering (or swapping dried TreeDiaper®
with soaked ones).