We do grammar informally all throughout and then my plan is to use Our Mother Tongue (along with Jump In) in grades 7 and 8. So dd will be starting her formal grammar program pretty soon now. I am pretty confident that this will all work out fine. Other experienced and knowledgable ladies on this forum helped me come up with this plan and I feel comfortable with it.
For informal grammar we have used the following for various children:
English for the Thoughtful Child vol. 1 and 2
Brian P. Cleary books
Fun parts of other writing programs as it fits (write shop jr.’s grammar folders were fun for my dd)
Grammarland audio book with or without corresponding worksheets
Also just talking over any writing that they have done and pointing out what things are and how they are used as we see them
HTH! Blessings!
-Miranda