I planted this kiwi from a seed out of one from the supermarket earlier this year. It's been doing great except lately the bottommost leaves have been curling and a couple drying brown at the edges but the newer ones seem unaffected. It does have fungus gnats i'm dealing with them, note the paper covering the soil. I water it every day and it sits either on my desk or in my south-facing windowsill. What is causing the leaves to curl? time for a bigger pot maybe, more/less fertilizer, watering?