I know this a old post but As some others have said - Roundup doesn’t have any soil activity. It requires green i.e., chlorophyll and temperatures above 50 to work. It seems you are writing this in June — personally I would wait another month unless you are positive the bulbs were say March or early April bloomers and have completely dried up. Many tulips bloom in May and all bulbs need to die down naturally or you risk the bulbs getting smaller each year which tulips will do anyway unless a perennial type. The bulbs get “food” by photosynthesis and need the sun until the leaves are totally dried up and back below the surface. A little bulb food or bone meal helps too. If there is still yellowish turgid pieces sticking up the roundup can seep into living tissue. It normally takes a couple of months after flowering and you don’t want to cut them off - the best you can do is braid the foliage and we did it for years - don’t laugh. But if you mark them - use a non toxic marking paint and spray a circle around each clump about 6-8” out from the base in all directions. The reason for the circle, is after you spray the weeds, you will 1) know where to not spray just in case but better is to plant in between a groundcover, or other plants like daylilies or whatever perennial for the location (sun or shade) that will fill in between the bulbs (tulips, daffodils, whatever) so the dying foliage isn’t noticeable and can die naturally but more importantly shade out weeds. The circle is to prevent digging up bulbs or damaging vital roots. You can use Preen (there are several varieties for the right situation (go to their Preen website) in and around your plantings several times a year to catch whatever weed seeds there are and keep them from germinating. Just remember no matter what you spray or use there are always more weed seeds. Even after mulching - birds drop weed seeds, and the wind blows the seed in. So using something like Preen (a pre emergent though they might have a post) several times a year is best. The next best is roundup on areas with no plantings (flowers,ground covers, trees, shrubs, lawn) — just bare ground covered with weeds. There are weed killers for broadleaf weeds and for grassy weeds and you must determine what you have in order to choose the right one. Honestly, most of us have both. I don’t care for post and pre emergent herbicides because they hang around too long and stop you from being able to plant anything else (seeds or plants) plus most kill clover and the little purple native violets. But it’s their soil presence that bothers me. Roundup may sometimes bind with the soil but it’s not doing anything - its just sitting there until it breaks down. I’m very distressed the Roundup gets the bad name because of one actual heard case (as far as I can tell). And it was well studied environmentally but the court case that was won was based on a “new study” however they didn’t run any new tests, they cherry picked a few cases out of the old study and reworked the data. All of this data is available to anyone who chooses to look at facts and not a bunch of hysteria from those who like to cause trouble and make money. Mostly that’s the lawyers who profit greatly at 20-30% of every case. Yes, we don’t want to be stupid —like any chemical they are all dangerous, so is the bleach, and cleaning products in your house and garage. Gas you put in your car, and insecticides we use on our animals to relieve tormenting flies and ticks - all chemicals have some detrimental effect if used wrong. Even vinegar if used higher than what you mix for salads and cooking. Horticultural vinegar is 20% and very corrosive and acidic. I have used Roundup for around 20 years and it has always advised protective equipment (long sleeves and full pants, gloves, mask that doesn’t allow penetration, and eye). To me anyone who gets cancer either can’t read or stupidly chooses to not read and follow full directions. Don’t blame the chemical company, they they have been telling us for 50+ years these are dangerous chemicals. Always, prior to buying any chemical go to the manufacturers website (not the seller or third party — most times I find, after 50+ years of gardening, they don’t know much more than you do. But read all about the product and the mfg tips and even other products they might have and then read the government required MSDS or SDS (safety data sheet) (M stands for Manufacturer’s) for the active ingredients and all safety and environmental issues. This way you will know what it might harm or where you shouldn’t use or dispose of the product. This goes for herbicides, cosmetics, laundry products — everything thst has some form of a chemical as deemed one by the government. For example if it’s highly toxic to aquatic life, don’t let it get to any body of water but also not into sewers or your household drains because that ends up in the local river, bay, swamps, etc. other ingredients are bad for not only fish, frigs, etc but for wildlife and pets to get to. Roundup, over all other herbicides, is about the safest we have in terms of no residential activity in the soil. And no matter what, never use chemicals near a groundwater source, i.e., wells and springs. That doesn’t mean you want to just spray/dump it willy nilly everywhere. Always go to the manufacturers website to get their full directions and tips for use and to see which product is best. They may have one that works better. Once you have the names of the active ingredients, look them up in reputable university or gov’t websites to see the possible damage — particularly to beneficial bugs and pollinators but certainly to us and other animals, water and air. They are in trouble. In lawns or around ornamental beds - there are better herbicides to use. And don’t forget to carefully read the MSDS/SDS sheets and label. Quite truthfully if you don’t fully understand how these chemicals work, the damage they can cause, it is best to talk to a company who is trained to do so and ask lots of questions. If something doesn’t jive, don’t use them — remember they are just trying to sell you a service - some are very good and conscientious— others not so much. I try to stay away from chain franchises and try to use local family operated service companies. And always make sure they will replace (full size) any plant they damage, stress, or kill along with the labor to do so. Always take pictures of your lawn, garden, and closeups of valuable plants before they spray the first time. Many of the chemicals that we now freely buy and use are really rated for professional use only. You will most times see it marked on the bag “professional use only” or will find the notation on the mfg website. That said, due to it being for professional use only and not suppose to be sold for individual homeowner use - many times the bags themselves might possibly not be marked but I believe most are. Many times bulk products (any type) are packaged more plainly and they assume only trained, certified individuals are buying and using them. However, due to the government having so much other stuff on their plates these days - enforcing who sells and uses what chemicals is not easy. They can work on catching big dumpers of chemicals but who is buying and selling what isn’t possible and would do what most people don’t want - become “bigger” govt. They need to crack down on the distributors, the “DIY pesticides, herbicides,fungicides, etc” retail stores, so they don’t keep sell these pro only products that are very dangerous unless you are trained. Part of the issue too is of price and gouging — if crooked pest and lawn companies only have access — they can charge us whatever and we can’t afford to do anything but go along with it. There are issues in the industry and we have to consider all of these. You can easily go get the training and be certified as a private applicator (your property only” or get commercial application. Here is the link from Maryland university for that state to give you an idea. Check for your own state. http://pesticide.umd.edu/certified-applicator-training.html. In fact many of these chemicals travel via USPS who has laws against most of being shipped but yet it’s shipped all the time - so we can only blame ourselves on the issues created. IF - you are someone who checks out chemicals prior to buying and after purchase reads directions twice when first using and reads again at each use AND follows those directions— then I applaud you. You will keep us all and the environment safe for future generations. One thing I haven’t mentioned and it’s how our grandparents and their grandparents got rid of weeds — old fashion hard work with a hoe or hoe-fork. Maybe a sythe for brushy fields. Up until about WWII, there weren’t that many chemicals available to everyday folks and until about 1980s, there weren’t all these weed eaters and pressure washers. I’d like to see us go back to those days — it was safer, and certainly quieter. Gosh it wasn’t until the mid to late 50s and really into the 60s that home use gas powered push mowers came into large use. I remember reel mowers still being used into the 70s but then the mowers we know today exploded into use everywhere. The point being - we kept our homes clean with plain soap, water, bucket and brush (even long handled ones) and we didn’t tear up wood, causing more algae and mildew, nor void siding, and window warranties or tear the stones out of aggregate walks and drives. We kept the weeds and grass in check with quiet reel mowers that did a much nice job on the grass and kept it healthier due to the type of cut and neighborhoods didn’t sound like a dull roar or smell like gas and oil every evening or weekend. Neither did it have the whine and smell of weed wackers. Big sharp sythes kept big fields clean of weeds and grass in good shape with no need for expensive mowers and tractors. Large properties used horse drawn equipment and then later on steam boiler engines. I can’t wait until the day it’s all electric or we go back to some of the old equipment so I can enjoy my ice tea on the porch in evenings. We won’t go back to horses, most likely, but electric solar powered mowers or muscle pushed reel mowers and hand held grass trimmers for beds and long handled narrow spades for properly edged beds would be nice. Even brick edges the way we use to always due them worked great — well until they introduced Bermuda grass (wire grass). There are so many things we use to do and we stayed in better health and shape and didn’t go broke trying to buy all this equipment and chemicals. We are being held over a barrel and being bankrupted and we don’t seem to care. All that money could be saved for hard items things we will still have decades and decades later and not not spent on a weed killer that has to be sprayed at a minimum several times a year or used up in one use and re-applied and purchased constantly month after month, year after year. Think smart and long term and about those to come after us.

I have used Roundup around the base of many trees and it has never harmed the trees. I would never (again) use a weed barrier like plastic. I believe the rule-of-thumb for mulching around trees is no more than 6" deep around the tree.

I'm going to unsubscribe to this thread soon, because it's getting tiresome...but, some adult in the room needs to remind a lot of people here, you simply don't completely understand what you're talking about. The level of glyphosate-o-phobia we've reached is just the latest trendy pseudoscientific hoax, like EMFs from powerlines in the 1980s. This IS NOT to say the stuff is completely innocuous - consider the stupid juror who asked the Monsanto lawyer to drink a glass of it. In a trial for the safety of household bleach and ammonia, would we ask people to drink glass fulls of those chemicals? No, of course not. Drinking a glass of any three of those would be a bad idea! (and btw this is not to say a test couldn't be designed to show it is ACTUALLY carcinogenic in some context...you could design a test to demonstrate that, about all sorts of substances that have not caused a mass triggering of Mencken's "booboisie"!) But insofar as I can stomach reading about these ambulance chasing lawsuits...every person claiming to be terminally affected by roundup (just going to use the trademark name from now on, because it's easier to type) has some other factors far more likely to have contributed to their cancer. One guy had not one, but two long-term hepatitis infections! One of them being Hep C, which is linked to NHL. Or the one who had some kind of gross misuse of the product...was it spraying it on himself to stay cool? I can't remember such banality. I worked in pharma research for a couple years after graduation. Even at a junior level, I realized that studies can and are designed to prove whatever the investigator wants them to prove. This is not some occult, cabalistic mystery...it's a widely known truth. https://bigthink.com/neurobonkers/believe-it-or-not-most-published-research-findings-are-probably-false This paper https://enveurope.springeropen.com/articles/10.1186/s12302-018-0184-7 states that "IARC concludes there is 'strong evidence' that exposure to glyphosate is genotoxic through at least two mechanisms known to be associated with human carcinogens (DNA damage, oxidative stress). " (my emphasis) but look at this report about bleach in water, from guess who, IARC: "Sodium hypochlorite induced genotoxic effects in bacteria. In single studies, chromosomal aberrations were observed in cultured mammalian cells, whereas sister chromatid exchange but no chromosomal aberration was seen in cultured human cells". So, it too causes 'mechanisms known to be associated with carcinogens'...but, elsewhere in the summary, "did not increase the proportion of rats or mice with tumours." I see nothing in the first summary (of roundup) about conclusive studies of actual carcinogenicity; i.e., how many rats or mice get tumors vs. controls. ________________________ The amount used in home gardens contribute probably like 0.001% of the human "bioburden". So I hope everyone who freaks out about a suggestion to properly use roundup to kill stumps, is eating 100% organic foods. And that means 100%. Don't think because something isn't genetically engineered, it won't have roundup in it. I was surprised myself, to find out that oats...not genetically engineered, yet - are sprayed with roundup at harvest, to force the crop to die and dry faster! If roundup is carcinogenic, it's no more carcinogenic than scads of other things not facing multi-billion dollar lawsuits: red meat, dairy, high sugar diets, high fat diets for some populations, alcohol, certain legal food additives, etc. etc. etc.

NHBabs z4b-5a NHWow a lot of questions, but all good/pertinent. 100% Ix-nay on a golf course lawn, first of all, ha, not our style/ethos. Just not all weeds with little splotches of grass - and those rare and hard to see. We did this last year maybe late summer, early fall, def not spring. The guy "power raked" (right, he barely got 2 inches below the soil), then spread a lot of peat, perhaps a little mushroom compost (mem hazy on that, tho that is what I do with my community veg garden plot). Sterility of compost and peat unknown, typical Home Depot brand. The grass seed/fertilizer was Scotts Quick'r Lawn (something like that). I too wondered if one of the batches of amendments/etc was laden with this darn bad seed....The area that is compromised is prob our main 40' X 25' part between our townhouse and the sidewalk, the parkway grass is not in great shape but not AS bad. Hand weeding would basically mean the whole thing, and would be brutal, it is a consistent coverage of the lawn. I could maybe rent a smallish tiller from Home Depot and turn over the whole thing as part of an overall plan - (the days of a 150-200 lb rototiller I used to use for our veg garden are long gone due to lumbar issues!) Confused as to whether I should apply some non-toxic ((at least not Roundup level) stuff NOW, as the seasonal clock is ticking. I do thank you for you comments and suggestions! We also have a soil sample in at Chicago's Loyola U labs, curious what theyll say...