I'm considering siwtching to coco for my next run, but I don't want to be watering 2+ times a day. If I go with just 100% coco, will watering once a day be sufficient? Can I use a hard container like a plastic pot with 100% coco to really retain moisture?
Can be less than once a day, but I'd also recommend once a day or more.
I find that when dry it's a bit of a problem to water, as the water won't go in evenly.
So good to keep it (at least) a little bit moist.
Kind of depends on if you're running your coco kind of like a soil mix, or like a hydro mix.
For a soil mix type setup, of course you'd need amendments, maybe organic amendments like YouTube "Mr Canucks Grow" style.
Then can water less often.
For a hydro style setup, then your hydro solution needs to keep the coco fairly moist, to avoid salts building up.
Can do a big once a day soak (preferably to run off), or a regular drip feed, for example.
One nice thing about coco is that it is hard to over water, it just won't hold it.
So I find watering more often than usual, but paying less attention to how much it needs or doesn't need.
As opposed to soil constantly checking the water levels, watering when dry but be careful not to over water too.
A nice compromise is using maybe 30% - 70% coco, along with soil.
The soil can be a good buffer, for moisture and also ions (Ca and Mg) and pH, too.
Of course that will also need some nutrient supplementation, either synthetic or organic.