My heliotrope plants are getting destroyed by something and it's not snails. It eats the leaves till there is virtually nothing left, eventually destroying the plant. What can I do to kill the perpetrator? Btw I live in Southern California not far from the beach.
There are several things you can do to prevent, and eradicate, any pests in your garden. I prefer natural, but there are many other ways as well.
Here is and article that will help: https://www.gardeningknowhow.com/special/organic/natural-home-pesticides-organic-garden-pest-control.htm
Just bought 4 Heliotrope plants with great expectations for an exciting new to me plant! When I began to plant them, I noticed that starting from the lowest leaves up, the leaves are turning black is shriveling up. They have been kept watered. Any thought about what the problem is? Thank you, Carol in Indiana. carol@slabach.org
Carol, I have this issue when growing heliotrope from seed but it does not seem to affect the plant. On all plants, remove discolored foliage immediately just in case there is foliar disease, usually a fungus. I would rig up something to cast shade on the plants for 2-3 days as they may not be used to outdoor sun. Leaf scorch is then a risk. Here are more general care guidelines: https://www.gardeningknowhow.com/ornamental/flowers/heliotrope/growing-heliotrope-plants.htm
When flowers dry during the summer, do I pinch them off to establish more flowers?
This article will help you.
https://www.gardeningknowhow.com/ornamental/flowers/heliotrope/growing-heliotrope-plants.htm
I believe my zone is 11. I am in south South Florida (Fort Lauderdale). What are the chances of getting either heliotrope or dahlia to grow here, or is it not possible?
Yes, both of these will, happily, grow here. These two articles will help:
https://www.gardeningknowhow.com/ornamental/flowers/heliotrope/growing-heliotrope-plants.htm
https://www.gardeningknowhow.com/ornamental/bulbs/dahlia/dahlia-care-grow-dahlia-plant.htm
I've been reading your article on how best to grow heliotropes. It suggests a feed for them that is heaviest in phosphorous. I always thought that you gave flowering or fruiting plants a feed that was heaviest in potash ?
They are heavy feeders and need both phosphorous and potash as well as nitrogen. Look for a fertilizer with NPK of 10-20-10.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/using-potash-in-garden.htm
My Heliotropes are still in pots for fear of being devoured by slugs and snails. Are they a favourite to these critters? Thanks.
They can be. This article will help you to control snails: https://www.gardeningknowhow.com/plant-problems/pests/insects/organic-snail-control.htm
How long does it take for Marino™ Blue Heliotrope Plant to flower as an indoor plant?
They will prefer when the temperature is warmer, but will flower within a year, usually. It should be less than a few months with proper care.
Here is an article that will help:
https://www.gardeningknowhow.com/ornamental/flowers/heliotrope/growing-heliotrope-plants.htm