Burpee super growing cubes works well, but I prefer peat pellets instead of their product if I have a choice. I thought I would give them a try, but they are not that great unless you have containers you want to use to plant in. You need containers to put the growing cubes into since they do not hold their shape themselves like the peat pellets. You just place them in a container and add water and they expand within minutes. I would prefer them better then seed starting soil since that is messy if they are the only other product available. They are clean and they do their job, but they are hard to remove from the containers at planting time since they do not have the outer cover like other peat pellets. It is hard to remove them from the containers without cutting the plastic off of the containers so you do not damage your plants. The seeds do germinate well with them and they do expand quickly. I would not recommend them to others. They are a little expensive for the amount you get compared to peat pellets.