Mexican Sunflower Plants

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  1. Mexican Sunflowers/Tithonia
  2. Mexican Sunflower – Dying Leaves
  3. mexican sunflower leaves sometimes look stressed at night
  4. Mexican sunflower
  5. Mexican Sunflowers
  6. Tithonia seed collection
  7. What is the name for the mexican sunflower that gets about 20 feet tall.
Asked by Willia1 on August 28, 2012
Mexican Sunflowers/Tithonia

My Mexican Sunflowers are about 6-7 feet tall but there are no flowers on them yet. Should I pinch back some of the green sprouts on the sides? Or do I need to just wait? I live in CT.

Robin

ANSWERS
Nikki
Certified GKH Gardening Expert

I would add a phosphorus rich fertilizer, like bone meal, to the soil. Plants frequently fail to bloom due to low phosphorus. This article has more information: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm

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Asked by joycelenhardt on September 25, 2012
Mexican Sunflower – Dying Leaves

We have several giant Mexican sunflowers. Leaves are constantly dying, which makes the bushes much less attractive. Do they need to be sprayed with something to counteract this? Thank you!

ANSWERS
Heather
Certified GKH Gardening Expert

It may have a fungus. This could cause the leaves to brown and die. You can spray the shrub with a fungicide to treat this possibility.

It may also be getting too much water. It is a plant that likes it drier than wetter. If the soil is not drying out enough between watering, this can also cause brown leaves.

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Asked by Mariano on July 17, 2014
Mexican Sunflower Leaves Sometimes Look Stressed at Night

The leaves look stressed and down when I see them in the morning but later in the day they are nice and green. Is this normal?

ANSWERS
theficuswrangler

It probably has to do with moisture and the way the plants handle dry environment, shutting down their processes during the hottest part of the day and the night -- that's when they look wilted -- then opening stomata, and moving moisture stored in their roots during the night into the plant tissues when the sun is shining.

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Asked by Terri teeter on November 26, 2015
Mexican Sunflower

If I collect the seed from this year’s plants and plant them in the spring, will they remain true and produce?

ANSWERS
Downtoearthdigs
Certified GKH Gardening Expert

There are several varieties of Mexican Sunflower and some are hybrids.
If your plant is a hybrid the seeds may differ from the parent plant.

https://www.gardeningknowhow.com/ornamental/flowers/mexican-sunflower/planting-mexican-sunflowers.htm

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Asked by edjamieson on October 18, 2017
Mexican Sunflowers

I\’m a first time grower of sunflowers. What should I do in the fall? Will the plants come back next year?

ANSWERS
BushDoctor
Certified GKH Gardening Expert

You should definitely harvest the flowers right after they die. They will usually be eaten by animals and won't have a chance to re-grow. Collect these and replant next year.

Here is an article for more information: https://www.gardeningknowhow.com/ornamental/flowers/mexican-sunflower/planting-mexican-sunflowers.htm

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Asked by Cathy Vakil on November 7, 2017
Tithonia Seed Collection

I have tithonia plants that just started flowering a few weeks ago (today is Nov. 6) and I have a number of flowers now but none have dried out to remove seeds yet. We had our first frost last night and there will be frost most nights from now on. Should I wait until the flowers dry out more on the plant and cut them off to keep the seed for next year, despite the frost, or should I cut the flowers off now and let them dry out inside? Or should I cut the flowers off and put them in water inside until the flowers dry up?

ANSWERS
BushDoctor
Certified GKH Gardening Expert

They won't continue to mature off of the stem, but I would say that your best bet is to harvest them now, and let them dry. You may get some seeds, or you may not. I fear the frost will destroy them, so it may be best to go ahead and try to salvage some.

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Asked by per6247 on December 5, 2017
What Is the Name for the Mexican Sunflower That Gets About 20 Feet Tall.

Do I cut the stems of a 20 foot tall mexican sunflower or just take off the dried flower? I have cut the stems to about 2 to 3 feet in the past but the plant is not bushy; is this the wrong thing to do???

ANSWERS
BushDoctor
Certified GKH Gardening Expert

They can handle a good pruning, so this will cause no harm. Regular deadheading will keep it healthy. You can cut the vine by about half, and it will not affect negatively in any way.

This article will give you more information about the plant (even though it is for the shorter cultivars the care will be the same): https://www.gardeningknowhow.com/ornamental/flowers/mexican-sunflower/planting-mexican-sunflowers.htm

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