Answer: Early spring or late fall are both good times to transplant hollies. Hollies prefer well draining, slightly acidic soils. If the plants were already growing well in your landscape, you soil is probably fine. If the plants are in nursery containers, you may want to amend the planting area with compost, peat moss or aged-manure to help acidify it prior to planting. Don't just dump the amendments in the planting hole - take the time to amend a large area by spreading organic matter and digging it in to a depth of 12-18". This is where it will do the most good for the roots.
When planting, dig a hole just large enough to accommodate the roots. You want the plants to be at the same soil level as they were growing before. After planting, fill in around the roots with soil and gently tamp it down. Then water well to help settle the soil.
Be sure to water your hollies deeply once each week during the growing season to help the roots become well established.
Best wishes with your hollies!
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