My pakistan mulberry just dropped all its leaves. Planted it last spring and it flowered and fruited almost immediately. Fruits tasted a bit grassy but not worried about that. After a couple months the leaves turned yellow. Tried a few things and eventually citrus and avocado food. Leaves colored up nicely after that, were good for a few weeks and then suddenly yellowed, dried and dropped a week ago. Should i be worried? My neighbors mulberry thats only a couple years older is still lush and green.