Growth Curve But Not Repeated Measures Analysis

I woke up this morning realizing that repeated measures was incorrect but my revelation did not go as far as to what was.

Here is my experiment:

I had 7 groups of 3 varieties of seedlings (experiment repeated twice). After approximently a month I would take data on one group of seedlings: leaf number, height, biomass, etc. As biomass data required cutting the seedlings I cut a different group each week. Different seedlings - so I can't used repeated measure. Any advise on how to analysis this would be very much appreciated.

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