What are your pesky bonsai weeds?

[SWfloirda]

Another vote for Oxalis, also green shrimp plant Ruellia blechum.

 

[PaulH]

Diluted Roundup or full strength?

Full strength per mixing instructions.

 

[Vincent Tanner]

Irish Moss for me. I pluck it with tweezers until there’s nothing left… but then it’s back!

 

[Wires_Guy_wires]

How it feels sometimes

 

[Shibui]

Diluted Roundup or full strength?

I now have oxalis and Irish moss pretty well under control in the pots. I use full strength, undiluted glyphosate. Wipe it on the leaves of weeds with a paintbrush whenever you see them. Need to be diligent for a couple of years to catch any germinating from seed in the soil but it can be done.

 

[Shamino]

I have an awful problem with Oxalis...but it only affects my tropicals and not my Junipers (which, in summer, are close together). Anyone have a reason for that? Maybe that my Junipers are in an unheated garage in Maine during winter and the cold kills the Oxalis???

 

[Wires_Guy_wires]

I have an awful problem with Oxalis...but it only affects my tropicals and not my Junipers (which, in summer, are close together). Anyone have a reason for that? Maybe that my Junipers are in an unheated garage in Maine during winter and the cold kills the Oxalis???

My junipers have less oxalis, but it's not absent.
I think oxalis might be inhibited somewhat by the presence of juniper roots.
Maybe junipers send out some volatile compound that oxalis doesn't like. Or simply the fact that junipers colonize a pot quite fast and leave very little room for any weeds.
Interesting observation though! Worth looking in to!

 

[Paradox]

The Irish moss on the gravel, I just remove manually.
Its the moss on the trunks that is the bigger problem
Vinegar kills Irish Moss
I've brushed pure vinegar on the moss with a hobby paint brush and at times sprayed a 50% mixture directly on the tree with no ill effects
I should die and fall off on its own but I usually pick it off with tweezers if I want it gone faster

 

[Shibui]

Does Trident maple qualify as a weed? I have to pull hundreds of trident seedlings out of the pots. Certainly more than any other real weed now that the oxalis is under control.
Tridents are also weeds in the garden beds.

Despite selling around 10,000 trident seedlings each year we seem to hardly make a dent in the numbers and each spring there are more.

 

[dbonsaiw]

Dandelions, stinging nettle, crabgrass. In the garden there’s tons more. Foxtail, pokeweed, and even datura.

 

[19Mateo83]

It’s the winged elm seedlings that drive me crazy every year. I don’t expect them to be as bad this year since two big ones had to be removed last year.