Hi all! I've started my petunia seeds and they already have 4 true leaves, so I've been potting them up into larger cups cause right now they're just in the little peat pellets. My question is, I gave them some fish fert at 1/4 strength so far. Do I water with this with every watering? Or just once a month or something? I've only done petunias once. And to be honest, this is the first time I've ever got into feeding plants. (probably my biggest problem with my lack of green thumb., lol). So feeding is kinda new to me.