I Have 4 plants, Alien OG, 2 Qrazy Trains, And Purple Urkle. The Alien was planted 4 weeks ago. The Purple Urkle about 3 weeks ago (which is growing slow) & the QT about 2 weeks ago which they are showing some promise. I'm not expecting a large yield of any kind but I want Strong plants and healthy buds. Any pointers on how to get plants to full health?