- 1). Identify which plants need dividing. Some plants like irises can become congested over time, so they greatly benefit from division. This should be done after flowering.
- 2). Dig up either the whole plant or a section of the plant that you want to divide. If the soil is dry, water thoroughly the day before. Using a shovel or garden trowel, begin digging a safe distance from the main stalk. For small plants, 4 to 6 inches should be fine, but for large plants, 8 to 10 inches is a safer bet.
- 3). Excavate around the plant, carefully. Try not to cut too many of the plant's runners, and be careful of the root ball.
- 4). Remove the loosened plant. Hold the plant and gently shake it. Much of the soil will drop from the roots.
- 5). Gently separate plants. As you shake and work, most plants will naturally separate into individual pieces. However, sometimes slight persuasion is needed. Try to never break the roots.
- 6). Shake and work the plant in a bucket of water for heavier soils and plants with more tangled roots. Again, many will fall apart, but some are more resistant, and it will be necessary to cut into individual pieces, each with a growing point on it.
- 7). Insert each piece into a pot of good-quality potting compost (soil mix). Firmly pat down the compost and then water it thoroughly. Place in a shady position until it starts to grow again.
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