why are all these leaves growing so small?
In the latest months I've noticed new leaves on several of my plants grow out very small and stop growing. It's not necessarily that the whole plant has stopped growing - just the new leaves come out stunted.
I do have artificial lights above most of these plants and water and fertilize regularly, even now in winter (half-strength Foliage Pro 9-3-6). The only thing I can attribute this to is maybe spider mites. I was able to see them before, gave showers and alcohol spray treatments to those affected plants. Now I cannot see spider mites no matter how hard I look. The plants where I see smaller than expected leaves are maranta, calathea, ficus burgundy and phalaenopsis orchids - all potentially succeptible to mites and in fact maranta and ficus definitely had them.
Can mites stunt the growth of leaves like this? And why do I not see them when they were visible before?