Wee Trees Bonsai Help Forum Advice for all
http://weetrees.co.uk/phpBB3/

Grass Invasion
http://weetrees.co.uk/phpBB3/viewtopic.php?f=5&t=18597
Page 1 of 2

Author:  Michael6 [ 08 Jun 2019, 15:47 ]
Post subject:  Grass Invasion

A few of my bonsai's are now starting to have heavy growth of a short, tight grass. Not sure what it is but I suspect it has come in from some garden material I've bought. And it is spreading.
The pictures below show what it is like. The third picture may be something different though.

I've removed it from some bonsais, but it has tough roots that just tear out but leaving a dense matting underneath.
Can I just leave it or will it detract from the trees health? It is not like moss and I'm bothered it may cause problems :-(
I've had enough issues with woody sorrell, and now this !

https://www.flickr.com/photos/133523782 ... 474527513/

https://www.flickr.com/photos/133523782 ... 474527513/

https://www.flickr.com/photos/133523782 ... 474527513/

Would appreciate any expert insight.

Michael

Author:  TomB [ 08 Jun 2019, 16:13 ]
Post subject:  Re: Grass Invasion

It's called pearlwort (sagina subulata) and it's a very invasive weed.
It will cause problems for your trees. The only cure is regular weeding - get the tweezers out.

Author:  paulpash [ 08 Jun 2019, 16:35 ]
Post subject:  Re: Grass Invasion

Michael, pearlwort mainly grows in permanently moist soils. A good way to avoid it if you can keep up with daily watering is to improve the amount of free draining components in your growing media, eg pumice.

Author:  daryl [ 08 Jun 2019, 16:42 ]
Post subject:  Re: Grass Invasion

I have found it in every kind of soil, whether it's permanently damp or not. The problem with getting rid of it is that it flowers and distributes its seeds while it is still quite tiny, often before you have even noticed it is there. Tweezers are definitely good for getting under the rosette of foliage and lifting it out with its roots. I have also used a contact weedkiller in the past on a pot that had a particularly dense covering of it. Applied carefully to the weeds with a paintbrush, it was very effective.

Author:  paulpash [ 08 Jun 2019, 17:13 ]
Post subject:  Re: Grass Invasion

daryl wrote:
I have found it in every kind of soil, whether it's permanently damp or not. The problem with getting rid of it is that it flowers and distributes its seeds while it is still quite tiny, often before you have even noticed it is there. Tweezers are definitely good for getting under the rosette of foliage and lifting it out with its roots. I have also used a contact weedkiller in the past on a pot that had a particularly dense covering of it. Applied carefully to the weeds with a paintbrush, it was very effective.


It doesn't grow in pure moler - not that I've seen.

Author:  Michael6 [ 08 Jun 2019, 17:48 ]
Post subject:  Re: Grass Invasion

Brilliant, thanks for the advice. The ones affected are predominately moist so I'll maybe change some mixtures when I come to repot.
I have spent a couple of hours already on it with tweezers in 3 pots.

Has anyone used "Organix Weed Blitz"? Not sure if it is available in the UK but it is mentioned on this Aussie blog:
https://mattsbonsaiblog.com/2018/07/09/ ... or-bonsai/

Author:  john blanchard [ 08 Jun 2019, 19:11 ]
Post subject:  Re: Grass Invasion

Don't use weedkiller in your bonsai pots!

Author:  Betula [ 09 Jun 2019, 15:56 ]
Post subject:  Re: Grass Invasion

You could also try scraping /hand weeding as much as possible then soil surface covering with a weed control fabric or black polythene mulch mat for a few weeks. It may not look pretty and you might have to water by plunging the pot in a bowl, but by excluding light you will kill off the weed.

Author:  Gary Jones [ 09 Jun 2019, 20:13 ]
Post subject:  Re: Grass Invasion

Wow - that's total coverage. The stuff is a pain and you'll need to remove it and then keep on top of it. In looser soil you can pick it out by hand but for compost or dense soil tweezers work best. I now remove it from any pot as soon as I can after seeing it.

Author:  daryl [ 09 Jun 2019, 20:25 ]
Post subject:  Re: Grass Invasion

john blanchard wrote:
Don't use weedkiller in your bonsai pots!


Why? If you use a contact weedkiller and apply it carefully it won't harm the tree.

Page 1 of 2 All times are UTC [ DST ]
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/