I am currently growing some flower and veg seedlings and I'm pretty sure I'm supposed to pinch some of the them out, the sweet peas particularly. I don't really know what that means - do I just remove the top two leave of the plant so the side shoots will prosper, ie, cut the stem of the plant just below the leaves? Or is it just pulling the leaves off the stem? Please help, I'm so proud of having grown stuff from seed, but I want them to thrive too! As well as sweet peas I am growing nasturtiums, tomatoes, courgettes, mini pumpkins, sunflowers and salad leaves. Do any of these need pinching out as well? Help!