The leaves don’t die or turn yellow, they just curl. And not all of them!
Curled leaves can indicate a plant is under stress. The type of plant isn't mentioned, but these articles should help:
https://www.gardeningknowhow.com/houseplants/hpgen/curled-houseplant-leaves.htm
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-leaves-curling.htm
https://www.gardeningknowhow.com/ornamental/flowers/begonia/curling-begonia-leaves.htm
https://www.gardeningknowhow.com/edible/herbs/basil/basil-leaves-are-curling.htm
Sometimes come to FL 8b and have a little garden. Some plants don't grow well, some disappear. Tested soil, a little alkaline. Would that be a cause? What should I do for amendment?
It depends to the requirements of the plants you selected. Consider doing a formal soil assay as sandy soil may have nutrient deficiencies. And also consider using native plants. Be ready to provide supplemental watering until well established. Be on the lookout for pests like deer, rabbits and squirrels.
Pond(see photo)-fibreglass circular salmon fisheries tank--no leaks. Around pond- rocks. Between rocks plants overgrowing down to ground level. When it rains, path is full of muddy water from soil between plants being washed down. How can I stop it? How can I permanently seal ALL AROUND at ground level to stop mud coming out? Those couple of stones I placed there did nothing to stop the leakage. I am 76--widow -need simple solution ? Thanks
It seems like you need to stop the flow from the origin. The water level is very high, can you reduce the water level? Also, add groundcover plants down the sides to absorb the water and stop the mud or add a thicker level of plants at the top.
https://www.gardeningknowhow.com/ornamental/water-plants/wgen/popular-pond-plants.htm
I loved your "12 Low-Maintenance Perennials Absolutely Anyone Can Grow" article and video! In case it helps, I'm in zone 8b, 4400' elevation, zip code 92372, high desert of So. Calif. Our Summers are routinely hot, dry and scorching. I tried growing Astilbe last year in partial shade and it got no taller than 4 inches before getting scorched by the sun and dying. I will try it again but in a shadier area. Aside from Astilbe, are there any other plants on this list that you think may not be so successful in my climate? I would like to avoid the time and cost of failures, like I went through with the Astilbe. Thank you!
You might try coneflower or sedum. I definitely would not recommend astilbe For warmer areas, or full, hot sun. Coneflower and sedum will be able to handle harsher conditions. These two articles will give you more information:
https://www.gardeningknowhow.com/ornamental/flowers/coneflower/growing-purple-coneflowers.htm
https://www.gardeningknowhow.com/ornamental/cacti-succulents/sedum/sedums-plants.htm