I hate to say it, but I'm afraid to prune my leucadendron argenteum, safari sunshine and red tulip. The argenteum has grown about four feet in the last 9 months, and has grown a ring of about 20 branches with a leader continuing up from there. I know that if I don't prune it, it will become tall, spindly and thin at the bottom.
My question is this: when is the best time to prune them? The safari sunshine and red tulip are struggling to grow taller than the deck so that they finally get some sun, and the shady, dark, wet San Francisco winter hasn't killed them yet, so I'm planning on just letting them grow. Its mainly the argenteum.