Brooms grow easily from seed, mine seed around the garden - the seed can be fired quite a distance from the mother plant. I have never heard of anyone bothering to take cuttings. The usual advice is to trim back after flowering to keep them green and bushy, but I haven't found that they grow well from old wood, so hard pruning is out. They can be kept to about 4/5ft if you trim back from the first year, but 2/3ft is not realistic, they are not dwarf shrubs. I have a number growing on a very steep bank and I just hoick them out when they get old and straggly and replace with one of the seedlings.
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Brooms grow easily from seed, mine seed around the garden - the seed can be fired quite a distance from the mother plant. I have never heard of anyone bothering to take cuttings. The usual advice is to trim back after flowering to keep them green and bushy, but I haven't found that they grow well from old wood, so hard pruning is out. They can be kept to about 4/5ft if you trim back from the first year, but 2/3ft is not realistic, they are not dwarf shrubs. I have a number growing on a very steep bank and I just hoick them out when they get old and straggly and replace with one of the seedlings.