I wasn't aware this was possible. I would like to know how to do it. I love Pentas and have had some pretty ones this past summer.

Here is what I found, it also includes many other plants.

http://www.spokane-county.wsu.edu/spokane/eastside/Fact%20Sheets/C062%20Houseplant%20Cuttings%2005.pdf

Barb
I've done it with lots of them. I haven't read the article, but if it says to take stem cuttings, I learned the hard way this works best for the older varieties, seed works better for the newer ones.

Gather your seeds when the plants dry out. Look your plants over, there will be dried up brown things where flowers used to be. This sounds sill, but if you haven't noticed them, that's because they are easy to miss.

Snip them off whole into a paper bag with a very tight bottom and allow the seeds to fall out. My favorite is a manila envelope...the seeds are tiny. Do you have any of those plastic produce boxes? Save some.

Let me know if you want more info....gotta run now

I never researched it but I've found stem cuttings to be easy with pentas.

kossetx
when I tried, I did not use rooting hormone...did you?

would you share your technique?

Sure, I use 2, 2liter coke bottles, I cut one 1/4 from the top and the other 3/4 from the top. Throw away the top from the 1/4 cut and the bottom from the 3/4 cut. This gives you 2 pieces that can form a long bottle. Cut slits in the top piece so it will fit over the bottom piece, which you also fill with about 4" of potting soil. Stick a cutting in the soil with at least 2 leaf nodes on it, mosten the soil, and put the top half on over the bottom. Leave the lid on the top half so you can add water when needed. You'll see the roots through the bottle when they form. Hope this makes sence.

As for root stimulator, I forget most of the time but I use saliva when I do remember.

Break off a piece, pull off most of the leaves, stick it in good potting soil, keep moist. I do things the easiest way possible, these things root like weeds. I have even rooted them in water! And I rot everything in water cause I forget it.
Tally HO!

I use Tally's "technique" on 99% of my cuttings (including my roses). The other 1% I root in water. I do find that timing the striking of cuttings (not in the heat of summer nor during dormancy in winter in most cases) has the most influence on my propagation success.
molly

When I tried, I used my favorite a window planter box. It keeps the soil wet at the bottom. I must have put in 10 cuttings and only one took. I did the other steps as suggested. This was in April or May, which should have been OK.

By seeds, I can get a zillion tiny sprouts but they take a long time to grow.

The plastic blottle techniq brought back memories. My grandmother would propagate cuttings under a wide-mouth jar in the garden....on OH not TX. She must have propped up the edge.

Thanks all, I'm digging up some of mine and crowding them into pots and those window boxes. They'll look pitiful come spring, but they'll be grateful to get some roon and leaf out.