Brown Leaves on Meyer Lemon
Our Meyer Lemon tree is having problems. It has been relatively healthy and just flowered recently and had three fruits growing. We recently brought it inside for the winter. We have owned it about 6 months, I forget how old it was when we got it (but it came with its first fruits just starting).
We are careful not to over water it. Once or twice a week. The medium is about 60% pine bark, 30% soil and 10% pearlite. (Not ideal, we should use less soil). PH is a bit high at around 7, but we are using vinegar to try and lower it to at least 6. We fertilize it with a 5-2-1 fertilizer about once a month. It currently gets as much light as we can give it, which is probably less than ideal.
The tree has been putting out new growth, leaves and flowers. The problem is some of the leaves are turning brown at the tips. Why is this? Could it be salt buildup? Soggy soil? I have included some pictures.