Yay! I have the 4th Cornerstone Seed. I started with a Fourpetal Reptans > Aureus Reptans > Venom Reptans (3 tries here) > Mela Reptans > CITRUS REPTANS.

Many thanks to 'Borg' (posted by LadyCFII) for the Excel Spreadsheet Breeding Chart w/4 addt'l sheets:

http://www.ldwforums.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=94929#Post94929

and especially 'sfrose' for the Breeding & Mutation Key Pocket Guide:

http://www.ldwforums.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=95769#Post95769

and this pdf guide to the seed tiers:

http://www.ldwforums.com/ubbthreads/ubbt...atalog-Rev1.pdf

These and many more guides are in The Plant Tycoon Guides Forum.

Cheers!