Roy M. Sachs
Thu, 06 Nov 2003 10:12:21 PST
Carolyn: Maybe this isn't the answer you want to hear, but, as with 
all chemicals, it depends on which one you use, how much you use and 
the bulb species in question. Many times the premerge hasn't been 
tested on your species so that you have to do small patch tests to 
make sure that there is no toxicity

I've had some bad experiences with a pre-emergent getting down too 
deep in the soil and inhibiting root growth (my 'soil' is 90% clay 
and root systems can be very shallow), but I've also had success when 
I have had sufficient organic matter to bind the pre-emergent very 
close to the surface.  Again, it's a good idea to do a small patch 

I have used both liquid (Surflan/oryzalin)) and granular (again 
oryzalin incorporated into granules) on alstroemeria; I prefer the 
granular for ease of application and saving my back-pack sprayers for 
other dedicated uses.

Big thing for mke is to remember where I used the stuff so that when 
I return to replant I scrape away the surface soil containing the 
premerge.  Don't want that stuff around the roots!

>Does anyone have advice on putting preemergent in my garden where I have
>bulbs planted.  Will it inhibit their growth or just inhibit the 
>growth of seeds?
>Carolyn in Los Gatos, CA zone 9
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