Im in my first grow using House and Garden. I am in my third week of Veg, and just started using the feeding schedule today. I used Fox Farm Ocean Forest, so I didnt use any nutes till the third week (today). I was told by the hydro store and the manufacturer, that it would be ok to use full strength feeding for my plants. I asked them about the 25% strength introduction, and they reassured me that the nutes were designed for the plants. Ill let you know tomorrow when I wake up if I get any nutrient burns! I am quite skeptical, but I did what they told me! Supposedly everyone at my local shop tells me that this stuff is the bomb! So I am optimistic that my plants will thrive from it! Ill keep you up to date. It was initially quite pricey, but if you look at the feeding chart, the nutes will last a good while.