I want to buy some mandevilla seeds. Where can I buy?
Here is growing information for this plant. Seeds can normally be attained from most garden centers or nurseries. You can also perform a quick search online for your local area to find retailers nearby.
https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-plant.htm
https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-propagation.htm
Will the mandevilla plant flower all year in south Florida? How does one keep it full looking even at bottom of vine?
Proper care and pruning will keep your vine happy and full.
A healthy plant is known to bloom year round in sunny Florida.
Make sure the plant has a good support trellis and is protected from winds.
Here is a link with care information.
https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-plant.htm
Can I save my mandevilla bulbs for next season? I live in the northeast. I cut down the plant not realizing they had bulbs or tubers. Can I still save the plant?
Did you leave the bulbs in the pots? This would be the most ideal situation.
Just move the pots into a dark location at temperatures that remain at a constant 40 to 50 degrees.
Keep the soil barely moist.
If you have dug up the bulbs you can also store the bulbs. This is a little bit more difficult and may not have as much success.
Wrap the bulbs in slightly moistened newspaper and put in a dark plastic bag. Store in a cool dark location with constant temps that are between 40 to 50 degrees.
Check the bulbs monthly to make sure they are not drying out, mist the newspaper if needed.
When spring arrives bring out your plants and bulbs.
https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-plant.htm
I live in New York state and the weather here doesn't get warm enough for my mandevillas until June, which doesn't give them time to grow and flower from being dormant for the winter. Can I put them under grow lights now to kick start them? And what kind would you recommend? I have them in my cellar and want to see if I can get them going so by June they will be ready for outdoors.
Yes, you can give your Mandevilla a start before the weather warms enough to bring outdoors.
Bring it into a bright location and wait for it to break dormancy. Do not introduce to much heat, make the transition gradual.
When you began to see new growth you can began to resume normal watering.
Here is a link with more information.
https://www.gardeningknowhow.com/ornamental/vines/mandevilla/winterizing-mandevillas.htm
Thank you for answering part of my question, but I need a little more information on what type of grow lights I need to use. I have 11 mandevillas in hanging baskets in my cellar and cannot bring them up into the house to give them the sunlight they need right now. I would like to start them down cellar on grow lights. Can you tell me what kind of lights I should use? Please try to give me specifics as to what I should buy, as I know nothing about grow lights or taking care of these beautiful flowers. I did cut them back in the fall and they are dormant now, but I am hoping that putting them under grow lights will wake them up so they will flower for me by June when I can put them outside again. Thank you
You an purchase lights that are specific for plant growth.
You an also purchase 'full spectrum' lights that will provide good light for your plants.
Here are some links with more information.
https://www.gardeningknowhow.com/houseplants/hpgen/fluorescent-lighting-for-indoor-gardening.htm
https://www.gardeningknowhow.com/houseplants/hpgen/what-are-grow-lights.htm
https://www.gardeningknowhow.com/plant-problems/environmental/how-light-affects-the-growth-of-a-plant-problems-with-too-little-light.htm
Why do I find dead bees in all my Mandevilla's flowers. I do not spray with anything.
This may be just a naturally occurring event, instead of something sinister.
Bee's live really only a short period. Queens are the longest living bees.
They may have lived out there lifespan and simply died.
Keep an eye out for any other signs of unusual Bee die off.
You can report large numbers to your local County Extension Office.
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/what-are-neonicotinoids.htm
My Mandevilla completely died above ground here in Florida with a few nights of below 30 temps. When I pulled it out of the container, there are many, many bulbous roots. Any chance if I replant that the plant will revive? I see no evidence of new growth.
Are you sure your mandevilla is completely dead? Have you tried doing a scratch test on a small section of outer bark to see if there is any green in the underlying tissue? If you have and there was no green, I would then cut the stems 6 inches above the ground and take a "wait and see" approach. If the root system survived the cold weather (hopefully it did), in time you may see new growth.