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I have these 2 shrubs (circled in red) that I need to trim.

I'm wondering if I can turn them into/trim it into a spiral shape (like in the 2nd photo).

I'm finding it very difficult to find what kind of shrubs I have and if it's possible to do this.

Existing shrubs:

existing

Spiral shrubs:

spiral shrub

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In one word, no, sorry! Training an evergreen by practicing topiary starts when the plant is small and involves repeated prunings over a few years. If you took your existing evergreens and pruned them into spiral shapes you would expose inside areas of the plant where there is no growth.

Most evergreens do not bud or grow from old wood with the exception of yews. This means after you pruned the areas showing the trunk would not grow out. You can see this when people find their cedar hedge getting too tall and they cut off all growth over a certain height. It looks powerfully ugly for a few years but the new growth from the perimeter grows up to cover the cut branches.

In your case new growth is only going to come from the perimeter of the shrub which will not give you the look of trained shrub.

Topiary demands yearly or twice yearly attention to keep the plant in shape. Perhaps you would be better off to plant a trained evergreen as they are commonly available at many nurseries in the States and Canada.

Edit: ItsMatt asks about an arborist that will prune your evergreen into a shape reminiscent of the cloud shape referred to here. You can do this too if you have a healthy evergreen but this is not the same look as the topiary spiral the original question referred to. It won't kill a healthy evergreen but older shrubs will still take yearly pruning to maintain a nice shape.

  • I don't know anything about spiral cutting trees but the question was interesting to me. Wondering about this image here: trees-to-please.ca/trees-hedges.htm down a bit on the page where they talk about the large spiral tree they've done. Is it your opinion that something like that will end up looking badly? Just curious. – itsmatt May 31 '13 at 17:04
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    The false cypress on that page doesn't look half bad and it looks like what i have in front of the taller ones i want to trim. As itsmatt said, is it just a matter of it wont look good, or does doing this to the wrong tree risk killing it? – lsiunsuex May 31 '13 at 17:21

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