Temperature controls on plant growth 1. Shoot growth 2. Stem/trunk growth Initiation and rate of 3. Leaf initiation/expansion growth etc is tem perature controlled 4. Root growth In colder climates, eg Boreal, temperature activates/ closes 'active cycle'ie plant 'shuts down'in between Eg. start growing season 5 days where MDT >5C end growing season MINT <2C Growing degree days accumulated temperature sum above a base temp eratureTemperature controls on plant growth: 1. Shoot growth 2. Stem/trunk growth 3. Leaf initiation/expansion 4. Root growth • In colder climates, eg. Boreal, temperature activates/ closes ‘active cycle’ ie. plant ‘shuts down’ in between Eg. start growing season 5 days where MDT >50C end growing season MINT <20C • Growing degree days - accumulated temperature sum above a base temp￾erature Initiation and rate of growth etc. is temperature controlled