I'm planting my garden now after 2 months of growing it inside from seed. This year my idea is to use coffee grounds mixed 50/50 with Miracle Grow garden soil for my potted plants––my local coffee shop has bags and bags of grounds for me to use and a friend where I used to live advised me she used this for growing blueberry bushes and other edibles. I'll be growing tomatoes, basil, and broccoli rabe (rappini) on my apartment balcony. Anyone doing this or have done so in the past? Do I have to use fungicide much for this? What other concerns or issues might there be?