Large Cymbidiums + self-sustaining watering method

[empiref]

Hello everyone,

Hope everyone had a Blessed Easter.

I have a dozen large cymbidiums which I will move outside for the summer, very breezy and windy spot. I will also be placing a 50% shade cloth on top to protect them from mid-day sun.

We have a water problem this year because of low rain and snow fall.

I was thinking about a method to drastically reduce my water usage and also because I am travelling for 2 months and don't have anyone to look after them.

All these cyms are in S/H.

I wanted to flush the pots and ad the fertilizer and kelpmax to the medium, and after that, cover the top of the medium and around the bulbs with thick plastic and tie it securely in order not to be dislocated by wind.

And by that, the water will evaporate and hit the plastic on top and then fall down into the pot, forming like a self-sustaining water system, like a closed terrarium.

Is there any ill effects on the orchids if I apply the above mentioned methods.

Looking for your experienced and guiding advice on the matter.

Thank you all in advance.