Foliar spray

Hey Pappy! Foliar feed pH between 6.2 and 7.0 - probably best to go 6.2-6.5 as you normally would water. Tip - spray just when lights go out the allow the mist / droplets to be absorbed or the light can reflect through droplets and burn your plant...I am wary of foliar spraying my indoors stuff cause I did just that haha Once upon a time I used 1tbsp / gal for outdoors plants that I used to run through a sprinkler (sinai, maybe 25 years ago, man they were the days) As conservative as I am though I would try a ppm of say 175-200 but add a bit of surfacant - agar agar powder is my old faithful for regular gardening (works a treat on dry lawn patches, bonsai root drenches and refreshing hydrophobic old soils and stuff like that), boil some up slowly until you get like a wallpaper paste consistency then mix say 250ml of paste to about 5L of water - this will 'make your water wetter' and if you use it in a very fine mister it would enable you to put a very fine film of feed on the plant, prevent large droplets forming and rolling off the plant etc - probably be a good aid for your purposes, I would suggest application once a month based on 200ppm and reduce that if you want to do it more often - I had some orchids years ago and they were a bitch to grow until I learned about using a surfacant in sprays as their roots were exposed and needed misting regularly, I tried aloe and yucca but prefer agar agar - you can get it for a dollar or two online. Hope that helps!