Abstract: A new and distinct cultivar of Magnolia tree named ‘MJK-MC1’, characterized by its upright and columnar in overall tree form; moderately vigorous growth habit and moderate growth rate; relatively large caliper trunk; freely branching habit with numerous lateral branches providing a full and densely foliated appearance; sturdy, thick, leathery and durable green-colored leaves that resist biotic and abiotic damage; late bud break which reduces late frost damage to flowers and leaves; flowering on first year's growth; freely flowering habit with numerous large white and reddish purple-colored flowers; and good landscape performance and cold hardiness.