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Greenhouse & Nursery Production FAQ

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Colorado Greenhouse & Nursery

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El Paso County Colorado Master Gardeners

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Colorado Extension

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Questions (13,790)

mystery plant, What is it??

I have a volunteer mystery plant in my garden. At first I thought it was a sunflower. I is now almost 12 ft. tall and has not made a sunflower head but has the making of blossoms or berries. I have searched the web to see what it is with no luck. Maybe you folks can help. Thank you, Please see attached pictures.

Harold (Pete) Praznik

3500 Meade St

Denver, CO 80211

c = 303-842-0669

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Denver County Colorado about 1 month ago

plants not thriving- copper poisoning suspected

I have an interesting problem that I need some help. I signed up to lease a plot in the Arvada Community Garden for the first time this year. At the beginning of the year the plot had vegetative growth including weeds, lettuce that self seeded and dill that also self seeded. As background information the ACG is located on 57th Ave east of Walmart and was at one time the reservoir for Arvada. The space was , I’m assuming, excavated at some point to allow water collection and the garden is watered using untreated ditch water that runs along the west edge of the property. The untreated water is used by all the gardeners. On May 28th through mid June I started planting tomato plants as well as cabbage, brocolli and cauliflower. In early June I planted herbs which included oregano, basil, sage and parsley. In mid June I planted corn seed followed by bush bean seeds. In total I planted the following:

Tomatoes, peppers, cabbage, cauliflower, eggplant, broccoli, basil, sage, oregano, bush beans, cucumbers, corn and onions.

I had some die off/stunting of the tomatoes, broccoli and cucumbers which I attributed to the cold weather in late May/ early June. In terms of soil preparation I did NOT rototill, rather I scrapped the surface to remove the growth and loosened the soil only where the plant of seed was placed. I water the garden every other day. I chose that watering scheme due to the soil cracking I was observing in the plot. Apart from some die off my plants were not growing though some were yielding immature ( ie small undersized) fruit even though the plants were small. Assuming some cold weather stunting I applied some Jobs Organic Tomato and Vegetable fertilizer to my tomatoes and peppers followed by a second addition in July to all plants because they still appeared stunted. At that point I collected a soil sample from my garden. The plot is 12x22 feet and I collected 5 samples from the 4 corners and center and then blended the sample prior to submitting the sample for analysis. The sample did sit for about one week prior to mailing and I am aware that this lag time might contribute to a lower N2 score. I have since applied the entire 4lb bag of fertilizer to my plants The results of the sample are attached and indicate a high level of copper that maybe toxic to plant growth In addition the sample indicate high levels of P, K and organics. I suspect that copper levels are the cause of my problem.

Next I looked at what could be done to neutralize or bind the copper. I found several options though I haven’t listed all:

  1. Replace the soil. I was not going to take that path as I do not own the plot
  2. Treat with phosphate containing fertilizers that will bind with the copper and prevent absorbsion I have to date added the entire 4lb bag of vegetable fertilizer to my plot
  3. Raise the pH which I don’t think is practical as soil pH is on the high side and further increases will retard growth
  4. Add organics which also will bind the copper though my plot currently has 7% organic material now
  5. Conduct bioremediation (phytoextraction) by planting and growing crops that will take up the copper.

I have not been able to locate the particulars (application rates, preferred additions or years required) to determine what, if any, method should be used on a plot of land that I do not own. Assuming of course that my identified root cause is correct. Any insight you might have on this problem is greatly appreciated. It maybe that the only practical economical option is to walk away from the plot. Any help or insight you can provide is appreciated I can also supply the soil analysis document. It appears this application does not allow uploading of pdfs

Jeff Staniszewski

Master Gardener Apprentice

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Jefferson County Colorado about 1 month ago

roses problem

I am not sure what's wrong with my roses. Everytime I cut the branch dies. The stems are splitting. Not sure why. Finally, not sure it the leaf damage is from neem oil or dicanil or something else. Seems like my engrid burgman, perfume delight, tea rose bush and red climber all have the issues

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Denver County Colorado about 1 month ago

Controlling insects in my pumpkin patch

I am growing giant pumpkins for my 2nd year and have many tiny flying insects in the patch this summer. I caught these 2 and attached some photos. There is another one that is a green florescent color, and similar very small size, Note that the photo of the leaf has the leaf sort of dried out since I picked it this morning. I think the holes are from bugs. Area is well fenced, so shouldn't be critters.
What should I use to control the insects and protect my plants.? Thank you.

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Arapahoe County Colorado 2 months ago

Rust Colored Grass

I have rust-colored grass and believe it to be a fungus. I have stopped watering at night and have swapped the blades on my mower for sharper ones. Is there anything I can do to combat this issue?

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Morgan County Colorado 2 months ago

Bright rust spots

I ma seeing my rose bush leaves curling up and dying upon further investigation there are bright rust spots on the leaves. What to do??

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Denver County Colorado 3 months ago

What is this tan beetle?

I am trying to identify this tan spotted beetle found on many of the flowers at my mother's property in Pueblo West. Specifically, we'd like to know if they will damage the flowers, and if so, how to control them.

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Pueblo County Colorado 3 months ago

Tiny bugs in the bathroom

Hello, I have these tiny bugs in our bathroom in Denver, Colorado. Thanks to your website I was able to identify them as “Duff Miilipedes.”
Thank you for your clear and excellent information!

Arapahoe County Colorado 4 months ago

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