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There isn't a seed to plant. Just plant anything for people to water. Once you spot 5 card gardeners in other gardens it will drop a tiger lily into the tea set

If you put some comfits food out you will start to attract the Card Gardener, then spot 5 CG's in other gardens & the 5th will drop a seed in one of the empty tea set pots you have out in your garden. Once you have 3 RFH cards showing you will begin to attract helpers like the White Rabbit or Dinah & they will give a clue as to whether that card is to high or low. You can then experiment moving them around or replacing them to get the correct card. You can also increase or decrease a cards value but only one time for each card. Once you have the correct card you will attract one of the 3 Caucus critters.... You need to attract 10 Caucus critters & spot 3...

Thank you very much for the help.  Very much appreciated

Except now you've planted something in every pot, so there's no pot left for the Card Gardener to drop a seed into.