On Fri, 19 Mar 2021 01:17:49 -0400, Michael Trew >
wrote:

>On 3/19/2021 1:00 AM, US Janet wrote:
>> On Thu, 18 Mar 2021 23:50:02 -0400, Michael >
>> wrote:
>>
>>> On 3/18/2021 12:32 PM, Sheldon Martin wrote:
>>>> On Thu, 18 Mar 2021 US Janet wrote:
>>>>>
>>>>> I originally went to Costco to pick up 4 bags of potting soil for $9
>>>>> each but they were all sold out. Apparently you need to get to the
>>>>> store when it first opens to get the potting soil. I guess a lot of
>>>>> people are getting into gardening these days. Another shipment is at
>>>>> the warehouse in Salt Lake and should be at the store by today or
>>>>> tomorrow.
>>>>> I just phoned Costco and the potting soil is in. Off to Costco!
>>>>
>>>> It's very easy to make your own potting soil, better quality and costs
>>>> less. Buy a bale of peat moss and a bale of sterilized compost. Mix
>>>> them together as needed and in a proportion you like. Be sure to buy
>>>> sterilized compost as any weed seeds it contains will have been cooked
>>>> dead. If you decide to buy Costco's potting soil be certain it's
>>>> sterilized or you will have a ton of weeds.
>>>
>>> I thought that I was nuts when I had weeds growing from pots and I
>>> suspected it was in the potting soil. I figured a commercial product
>>> like bagged potting soil would be free seeds and the like... guess not.
>>
>> If you had weeds in a pot that you were growing indoors, then yes, the
>> potting soil had not been sterilized. Outdoors however, the air is
>> full of seeds. The wind can blow them in from several states away.
>> Most probably the weeds are from something that recently bloomed
>> nearby.
>> Janet US
>
>Indoors

Most weeds are from critter poop, especially birds. Birds eat seeds
and then usually plant those seeds many miles away.