How do I encourage blooms on my agapanthus?
This article will help you.
https://www.gardeningknowhow.com/ornamental/bulbs/agapanthus/agapanthus-not-flowering.htm
What can I spray to rid agapanthus
Herbicide with glyphosate will kill your plant, but use caution; it will kill anything it touches.
https://www.gardeningknowhow.com/plant-problems/weeds/glyphosate-information.htm
Why do the outside leaves keep going yellow and slimy. The plant looks healthy and the flowers are amazing at the moment but wonder if I am over watering
You should treat your plants with Neem Oil. Neem Oil is organic and will take care of most sucking insects.
It is safe for people, pets and Bees.
Here are some links with more information.
https://www.gardeningknowhow.com/garden-how-to/info/what-is-honeydew.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
Every day or two I pull five or six dry brown leaves from the plant. Is this too many? How do I prevent this?
This could be due to environmental conditions, watering issues, lack of moisture, pests or disease.
It also could just be natural aging of the plant as the flowers mature and age.
Look for any signs of pests or disease on the leaves or flowers.
Treat with Neem Oil if you see pests.
Make sure the soil is moist, not soggy or too dry.
https://www.gardeningknowhow.com/ornamental/bulbs/agapanthus/diseases-agapanthus-plants.htm
https://www.gardeningknowhow.com/ornamental/bulbs/agapanthus/agapanthus-plant-care.htm
We have had weeks of triple digit Heat, my agapanthus are mostly dried leaves. Should I cut them down ? Will they grow back? It is currently in the mid 90's here on Northern California.
This article will help you.
https://www.gardeningknowhow.com/ornamental/bulbs/agapanthus/cutting-back-agapanthus.htm
Can I save Seeds from an Agapanthus,if yes when and how also how I plant them Thank you
Follow this link for the info: https://www.gardeningknowhow.com/ornamental/bulbs/agapanthus/propagating-agapanthus-seed.htm
When do I remove the dead flower heads?
You will be fine to prune at anytime, however best results are in winter. Here is an article that will help:https://www.gardeningknowhow.com/ornamental/bulbs/agapanthus/cutting-back-agapanthus.htm