If the offering is for seed packets, then I do not think the plant is included. (these offers are for players who already have the plant a chance to level up)
If you press the information button (the little in a blue circle) on the top right corner, of the item on offer, it should tell you exactly what you are getting.
Unless there is a recent change, Ghost Pepper is a Gemium plant, which you will need to buy it with 100 gems from the green (Plants) tag in the store when it is available.
I hope my previous post would have given you the answer you are looking for.
https://answers.ea.com/t5/Plants-vs-Zombies-2/How-to-unlock-plants/m-p/12180472#M46650
