In an attempt to get more enrichment into the lives of our two house cats, I purchased a collection of items from the CatIt sensory line. The cat grass station and the catnip station are huge hits with one of my cats (unfortunately, neither cat is interested in the play circuit, and the slow feeders were a complete NOPE from one cat, while the other gives the lower one a rating of "Meh" and ::yawn::).The cat I'd initially purchased the entire collection for likes the cat grass station, but will only munch on it for a moment or two intermittently. She's not overly fond of it and doesn't seem to really be into it. I've tried leaving it for her 24/7, and also putting it down and picking it up so she doesn't have constant access, but she's just not hugely impressed. However, my other cat has turned into a legit addict, and will yell at us to put it down for her (I pick it up for watering and to leave under a grow light). This said cat will also overindulge and then vomit (ICK), so I only put it down for her a few minutes at a time so she's not throwing up on my new carpets.I've had this for an extended period of time and have grown several cycles of grass now. There are pros and cons to this station: The mesh top is an awesome feature, as it helps grass to grow nicely, supports the lower area of the blades/stalks, and prevents cats from (mostly) pulling the grass up from the roots; the water collection tray prevents leakage and overflowing onto surfaces; the wide base doesn't have anything for a cat to grab onto, so tipping over or relocating (by a cat dragging it, for instance) is highly unlikely. Unfortunately, there doesn't seem to be any advice or tips for preventing mold and mildew from forming in the tray that holds the vermiculite and seeds. I've tried removing that tray and watering on a drain board in my kitchen sink to allow the water to fully drain out, and thoroughly drying the outer tray so there's no excess moisture, I've watered with only a spray bottle to minimize the amount of water I use, I've also tried spreading out the time between waterings - all to no avail. I'm still getting mold, mildew, and/or fungus in those two bottom trays. Despite that one fairly frustrating flaw (I really don't want my cat's lungs getting blasted with mold, mildew, and/or fungus spores every time she wants to nibble on cat grass, that can't be healthy!), I'm going to keep at my experimentation and see if I can find a way to get the benefits of enrichment and cat grass for my cats, while finding a way to avoid the unpleasant extras of growing it in this item.I'd love it if CatIt chimed in here to give precise instructions for preventing this. This comes with very basic info, but there's nothing provided that tells you to say, only grow it for ten days and then discard and start over, or to only water every four days, etc.One tip that I can pass on to others using this is that I found that by soaking my seed for around six hours or so before planting, my seed sprouts much faster and grows far more quickly (it made an enormous difference). Additionally, I was able to pick up a second unit when there was a sale, so I have the ability to have a new one growing as a mature patch of grass is being nibbled on. I haven't done this yet, but I have that as an option at a price that I was comfortable with.