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How do people keep under control evasive type plants. When you buy them from the nursey it says things like "grows in medium size clumps" but in reality they can take over the whole yard. Plants like Rudbeckia (black eyed susan) and Joe pye weed. Not only do the keep on spreading but also reseeding and they always reseed within another plant and end up killing it. Over the past two seasons I've removed most of the black eyded susans and have a small patch left but they've reseeded within other plants
To my knowledge, all you can do is be persistent, and remove the invaders whenever you encounter them. Here, the Himalayan blackberry is an invasive pest (even though this time of year they contribute tasty fruit) that is just biological barbed wire if you don't rip it out as soon as you see it.
glxyman21
One trick you can try is to remove the flower before it goes to seed. A plant uses lots of energy to produce seeds, thats why "deadheading' will produce more flowers.
Also certain invasive's to your area can be controlled by removing berries.
They just put the Nandina "heavenly bamboo" on the list here. It seems the birds eat the berries and when they "get rid of the seeds" is the reason these plants have been put on the list. By removing the berries I can keep the plant and still have a "florida friendly yard"
karla
I have finally gotten the "mexican petunia" out of my yard.
How do people keep under control evasive type plants. When you buy them from the nursey it says things like "grows in medium size clumps" but in reality they can take over the whole yard. Plants like Rudbeckia (black eyed susan) and Joe pye weed. Not only do the keep on spreading but also reseeding and they always reseed within another plant and end up killing it. Over the past two seasons I've removed most of the black eyded susans and have a small patch left but they've reseeded within other plants
any advise?
Try using Preen a pre-emergent, after you pull out all the clumps. It prevents seeds from germinating. You sprinkle it around the soil about every three months or so. Get the Preen that has a green color on the lid. This type has a fertilizer in it. When you use a pre-emergent such as Preen over a long period of time it takes the nutrients out of the soil so buying a pre-emergent with fertilizer in it is helpful.
Black-eyed Susans also send out runners that can become "new plants". They are easy to remove in early growth buy just pulling them up. Hope this helps.
So many plants are becoming invasive lately- the list is growing (Global Warming, anyone?).
If it's something that reseeds itself (such as the black-eyed susans), I'd remove it entirely. Seeds blow in the wind and get picked up and carried by birds as Karla said. There's no way you can control all of that.
If it's an invasive that spreads by runners underground, I'd still plant it if I really wanted it - I'd just set up a barrier.
I have some Ruellia, which is what Karla mentions above as Mexican Petunia. Some of the Mexican Petunias are invasive, some aren't (the new ones are sterile and the short pink Mexican Petunias are not on the invasive list at all, they're fine). I was given one from a neighbor, and since I don't know if it's the newer sterile version or the older version, I've been monitoring it in a container until I can see how much it will spread. It seems to be a slow spreader, so I will put it in the ground with a barrier and I expect it will be fine. if it's not, I'll remove it.
If you're in a warm climate, such as Florida, everything has the potential to be invasive it seems .
If you are a southerner, you know the true invasive plant-KUDZU!
If you aren't...Count yourself lucky you don't have that one, LOL. Kudzu is one of the most common and troublesome weeds of rights-of-way, power lines, roadsides, and forests, barns, children...anything standing still for longer than 10 mins! Liz
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