Months with links will lead you to a concluding post of the month with all the relevant links I've found and used. Those without links will not lead you anywhere but if you go to the mentioned month, 2012, in the Blog's Archive list you will see some posts on the subject. Months have no text are those I missed and completing these days. You are welcome to visit them and try them yourself, they are fun and at times really easy to do.
The flowers were chosen randomly.
January: How to draw a Rose - 6 tutorials.
February: How to draw a Tulip - 5 tutorials.
March: How to draw an Iris -
April: How to draw a Lily -
June: How to draw a Calla Lilly - 3 tutorails.
July: How to draw a water lily - 4 tutorials.
August: How to draw a Narcissus/Daffodils - 6 (+2) tutorials.
September: How to draw an Orchid -
The plan is to replace all the b&w thumbnails with colored ones. Good luck to me.
Enjoy your drawing,