Thank you for your Easter greetings.
In answer to your q's:
1) you could use soil/water/pots to link into growing, another thing you could do is the celery in food colouring trick which shows how 'plants' suck water up.
2) do you mean a template to stick the seeds to? If so you could do a sunflower and use sunflower seeds for the middle and tissue paper for outside and then sow the seeds and have a 'who's is the biggest sunflower' competition. Or if you are concentrating on numeracy, a I am suddenly realising you are

you could use templates of numbers with each seed stuck to it and for example use a big seed (like a bean) for 1 etc.
additionally the sunflower thing would work as you could bring measurement into it.
I hope this gives you some ideas??