I grew from seed black pennys and shock wave petunias and put them into two planters with a clumps of optic grass (so cute!). It's the strangest thing, because one planter is thriving and the other is doing okay. They grew from the same seed, have the same soil, same planter and same location. they both have the same fertilizer (the slow release) and have been watered at the same time. It's just strange. The planter that is doing better has just exploded this week and I just can't figure it out. Why would one do so much better than the other?