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If you have a plant you'd love to grow that seems too tender for your region's temperature zone, there are some things you can try. For example, locate the plant by a south facing brick or stone wall. These structures store heat by day and release it at night and may warm the immediate area as much as two zones. In colonial times, gardeners used a technique called "hot-bedding". They would build a soil bed on top of a pile of fresh manure; the heat of decomposition was enough to change the climate by a few zones for the winter. Placing tender plants by man-made heat sources, such as HVAC vents may also do the trick. Be creative and try your ideas with just one or two specimens.

Different plants have different growing seasons.

Rhizomes
Irises and some other plants grow from rhizomes, which are like bulbs but they grow horizontally along the ground. To divide rhizomes, just dig them up and rinse off any excess dirt. Break or cut the rhizomes apart.

If there's still any greenery on the rhizomes, make sure each one has one or two stems when you divide them. Then just trim back the foliage and replant.

[edit]Dividing Other Bulbs
The process is similar when you're looking at dividing other bulbs. If you have a big clump of bulbs, you can gently dig it out and then just pull the individual bulbs apart. Discard any soft, damaged or dried out bulbs and replant the healthy ones immediately.

Lily bulbs have outer scales that can be removed and replanted individually.

[edit]Division by Digging
For plants that aren't bulbs that you want to divide, simply dig up the whole plant and use a shovel or pitchfork to gently divide the root systems. Then just replant them and water well to help establish the new plants.

[edit]Shrubs
If you're trying to grow a new shrub or plant that has a woody stem, instead of digging up the plant just cut off a section of the existing plant that has three or four divisions of leaf nodes.

Remove the bottom leaves so that the bottom two leaf nodes are clear of leaves. This is where new roots will grow. Dip the end of the stem in rooting solution, then plant it in a container filled with vermiculite or perlite. Cover it with a plastic bag, making a sort of greenhouse to help keep moisture in.

After about a month, give the plant a gentle tug. If you feel resistance, you've got roots and it's time to transplant.

Transplanting Tips
When determining how to transplant divided flowers and plants in the fall, replant them in the same manner you planted the bulbs or plants when you first put them in your garden.

Consider light levels, the condition of the soil and how much water the plants will need, just like you would have done with the original plants. It's a great idea to keep plants in the same bed or in a bed that's similar to the one the plants came from to ensure continued success.

It's also a great idea to transplant on a somewhat cool and cloudy day, as this will put less stress on the plants. Always plant bulbs to the recommended depth so they won't freeze over the winter, and water plants after they have been transplanted so they will be happier in their new home.

Hi, Could you please advise us when would be the best time and how to divide Hydrangeas? Thank you.

It's a good idea to know how to transplant divided plants and flowers in the fall so that your garden will have a great new look come springtime. With the cooler weather in the fall, there's less stress on your plants, making it a perfect time for transplanting.