I have cut very large buddlejas to six inches. New growth then came from ground level. If you want to be sure, take a cutting off of new growth now. Its the wrong time of year if you read the textbooks, but it has worked for me in the past.
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I have cut very large buddlejas to six inches. New growth then came from ground level. If you want to be sure, take a cutting off of new growth now. Its the wrong time of year if you read the textbooks, but it has worked for me in the past.