London (change)
10 messages
05/02/2013 at 14:49

I have some clumps of dianthus in the garden. The largest no longer flowers and has become very woody in the middle. Can I replant the outer pieces (which don't flower at the moment) or would I be better off taking cuttings and starting again? The ground is sandy and well-drained, because there used to be a patio laid on sand and some remains in the soil. We add compost regularly and I have also added some topsoil. Nevertheless, it is not the most fertile part of our garden. A more general question - are dianthus short-lived perennials, because they don't seem to last long in my garden? Are there are any particular keys to making them flower and last well? Many thanks.

05/02/2013 at 15:23

I doubt you will be able to split these successfully-but they do root  fairly easily from cuttings

05/02/2013 at 18:37

Why not do both - take cuttings and split some of the outer bits off if they are rooted and replant.  Definitely one of the easiest plants from which to take cuttings and those root easily.  I just pull-off sections about 5 inches long with no bud and put 5 or 6 around the sides of a 5 inch pot filled with 50/50 sand and compost, then nip the tops off when they show signs of growing to make them bush out. Dianthus all get woody in the middle over time, so you do need to propagate from them every few years.  As is mentioned in another thread, they don't like acid, wet or heavy soil, but don't need a very fertile one.

05/02/2013 at 18:43

I did a very lazy dianthus propagate. Mrs Sinkins got leggy so I spread her out and covered the woody parts in gravel. Looks like several plants now and going well. Might extend it further this year.

05/02/2013 at 21:17

Thanks, all. Nutcutlet, great idea! Can I ask again, are there ways of ensuring that Dianthus do well? Would feeding them be a good idea? Or do they do better if they are in less rich soil? I have tried to find this information elsewhere but haven't had much success. Many thanks.   

05/02/2013 at 21:26
Pipings or cuttings are easy and very successful. Old dianthus plants....for me 3 year old plants are old....aren't worth keeping. Cuttings every year or so is best policy. Yong plants look better in foliage and in flower. Warm, well drained alkaline soil is necessary. Not sure about poor soil...they need something nutritious....but not rich soil. Cuttings make flowering plants in a season
05/02/2013 at 21:31

Mine do best and last longest in my poorest driest soil but I sgree with Verdun about the cuttings. Not neccessarily yearly for me but as they start to look straggly. 

05/02/2013 at 21:53

Thanks for this info. Obviously, then, they are quite short-lived as useful garden plants. I put mine in my poorest soil, too, thinking it was suitable for them, so I'm glad to learn that I was right about that .I'll remember to take cuttings regularly and replace plants. Obviously, it is better to plant plenty of rooted cuttings than to hope for larger clumps. A bit of information goes a long way!

06/02/2013 at 11:15

Try putting compost in between the plant, to cover up the base of the shoots, leave till late spring and with luck these outer pieces will have developed roots of their own and you will be able to separate them and pot up in a sandy mix.

06/02/2013 at 13:47

Wow! Great suggestion! Thuis is similar to Nutcutlet's suggestion above. I will most definitely do this! Thanks, Jayne11.

email image
10 messages