I've only had a little experience with plants but from experience, there are some plants that don't do too hot in a new tank. I've noticed that plants that rely on a healthy root system usually don't take root until the gravel is established.
Throwing a sword in there right away will probably not be successful... but everything else I've added right away took off ok.
Throwing a sword in there right away will probably not be successful... but everything else I've added right away took off ok.