Sorry to confuse you.
You are basically cycling with fish during a silent cycle. But, plants (especially fast growing stem plants) take in ammonia. If you started with a handful of fish (stock slowly), the ammonia would be relatively low to begin with. The plants would then take in this ammonia and make the tank safe for those fish (so you aren't exposing them to ammonia, since the plants use it). Its called "silent" because if you have enough plants, you likely won't get any ammonia or nitrite readings. If you get any at all, they will be very low. Then you add a few more fish a couple weeks later....slowly building up the bioload and increasing the ammonia in the tank (bioload will eventually be able to handle any extra that the plants don't take in). Hornwort and Wisteria (in that package) are both great nutrient hogs, including ammonia.
I did this with my first planted tank, the 55g. I put a bunch of stem plants in the tank (tons of Wisteria) and started with 6 Head and Tailight tetras. Looking back, I would have chosen something that I liked better. I could have given those to the LFS, but you get no credit around here.
I added 5-6 more fish a couple weeks later and did this every 2 weeks until I was fully stocked. I never once got an ammonia or nitrite reading and eventually started getting readings of nitrates (meaning I cycled).
Also, Eco Complete supposedly has some good bacteria in it (reason it comes in packed in liquid). Not sure how true that is, but it can only help you.
I don't advocate a harsh fishy cycle, so I wouldn't mention the silent cycle if I didn't know it would work. The key is to have enough stem plants to take in the ammonia. You can always do water changes if you do have ammonia and/or nitrites over 1ppm, but this is not likely.
If you do a fishless cycle (using pure ammonia or a prawn), then I don't suggest you put the plants in yet. Yes, they will take in some ammonia, but the ammonia levels get so high during these cycles that you risk feeding an algae farm because it will be more than the plants can handle.