When /how is the best way to divide a lavender plant that has gottn too big for its space?

No, sorry you cannot divide lavender. Lavandula (lavender) are technically classified as shrubs or subshrubs. They grow from a single stem, so there is nothing to divide. If you need to move it because it has outgrown its space, you have to dig up the entire root ball and move the plant and root ball to a new location.



The only way you can propagate a lavender plant is by sowing the seed or taking cuttings.



Propagation:

http://www.gardenaction.co.uk/plantfinde...

http://www.gardenersworld.com/how-to/pro...



Sowing seed:

"Lavender seeds have a low germination rate (how many seeds out of 100 come up). They can also take a long time to sprout (two weeks or more). Seeds benefit from light, so cover lightly when sowing. The germination temperature should be around 70 degrees and spring seeding is more successful than fall seeding. Those seeds that do sprout will take one to three months before they have enough roots and top growth to allow successful transplanting. Adding fertilizer to the sterile medium used in the seed tray can help the little plants get off to a better start.

After they are transplanted into small pots, the plants will be about three inches tall and have a single stem. It will take another three months or more to make a plant substantial enough to transplant to a larger pot or to the garden."

-I saved this above info. a long time ago but lost the link.



Fun info. on the different varieties:

http://www.mountainvalleygrowers.com/lav...



Good luck. :)

When /how is the best way to divide a lavender plant that has gottn too big for its space?
That's right, you can't (or shouldn't) divide a lavender plant, but you can prune it quite a bit. It might look bad at first, but it will get bushier and end up looking a lot better in the long run. Spanish lavender can have up to half of the foliage cut back and English lavender can have one third of the foliage pruned. It's best to do this in early spring. After it blooms you can prune it a second time. Plants are relatively cheap, so if you need a smaller plant, try a dwarf lavender plant instead and remove the old and overgrown one.
Reply:when it has gotton to big for it's space divide it.separate the roots carefuly and you will be fine.