I did have them outside for an hour yesterday. Out of 20 plants 7 plants were affected
I does appear that something has eaten them. Unless you catch it in the act, or see signs of the pest, it will be hard to say what.
Here are some articles that will help you craft your own pest control:
https://www.gardeningknowhow.com/special/organic/what-are-organic-pesticides.htm
I bought a zinnia plant which was already grown in a small pot. I kept the plant in a good sunlight place and good air circulation. It bloomed 3-4 flowers but, after 4 days plant started drying up like in the photo. I’m not sure what to do next. I just cut off the grown and dried up flowers alone for now. Please let me know on: a. What is the next step that I should take? b. How often should I water ? c. What’s the ideal pot size to grow zinnia ? d. What should be the routine care for it ?
I would get it in a pot a couple sizes larger (regular potting mix) and water it every day unless it is still moist. Zinnias in pots dry out quickly. If you have a nice garden space, you also could plant it. If in the ground, it will drop seed at the end of summer and should return next year. The kind you have do better inground.
https://www.gardeningknowhow.com/ornamental/flowers/zinnia/potted-zinnia-plants.htm
got no response. I don’t have additional details.
It looks very much like poison ivy, but I can't believe anyone would send you seeds for poison ivy, or even have seeds.
If there are any thorns it is not poison ivy. Poison ivy usually has some notched leaves, which I don't see, but it can also have smooth edges. Poison ivy usually has veins closer together than these are, too.
I don't think I would take a chance. I would use glyphosate and eliminate it.
https://www.gardeningknowhow.com/plant-problems/weeds/poison-ivy-control.htm
I planted zinnia seeds under a row cover after the first batch of about 100 new seedlings just disappeared overnight in the same bed. One night they were fine and the next morning they were gone, stem and all. The first batch was planted in open air without a row cover. Now the second batch of seedlings under the row cover are having their leaves eaten off by something. I have probably a couple hundred growing and at least a hundred that only have a stem sticking up with no leaves. What could be eating them under the cover and how do I kill it?
Unfortunately, unless you see signs of what could be eating them it can be very hard to tell what will be the culprit.
Insects, gophers, moles, and voles may still be able to get into the row covers, as can slugs and snails. Many of these creatures can leave signs of being there.
In the meantime, these articles can help you to keep out some common pests:
https://www.gardeningknowhow.com/special/organic/what-are-organic-pesticides.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/kill-garden-slugs.htm
https://www.gardeningknowhow.com/plant-problems/pests/animals/mole-control.htm
https://www.gardeningknowhow.com/plant-problems/pests/animals/vole-control.htm
The petals of these plants also have small brown spots on them. They continue to bloom and look healthy except for these brown dry leaves which I pull off.
Here are a couple articles that will help you solve the problem:
https://www.gardeningknowhow.com/plant-problems/environmental/what-causes-brown-edges-on-leaves-of-plant.htm
https://www.gardeningknowhow.com/ornamental/flowers/zinnia/growing-zinnia-flowers.htm
I live in southern arizona. Answers here say that overwatering is the cause. It says to let them dry out. I wasted every other day. If I don't I get leaf wilt. I am getting leaf curl. The temps here are 100⁰to 110⁰ on anyday. What should I do.
They will definitely wilt in the heat. Water will not be the answer, though, unless the soil is completely dry down to about 3 or 4 inches.
Shade cloth during the heat of the day will be the best defense against wilting.
With proper shade and watering habits they will stay healthy.
Here are some articles that will help:
https://www.gardeningknowhow.com/ornamental/flowers/zinnia/growing-zinnia-flowers.htm
https://www.gardeningknowhow.com/garden-how-to/info/shade-cover-tips.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm
I am doing 3" clay pots for wedding favors. I am also providing the guests with the seeds and the potting soil so they may do their own planting. I have no idea how many seeds to put in a small zip lock bag.
For a pot this small, I'd suggest 5 seeds to each, in case a couple don't germinate. Here's a great article about types of zinnias:
https://www.gardeningknowhow.com/ornamental/flowers/zinnia/zinnia-plant-varieties.htm