I wish to know what is the best feed to put on my vegetable and flowers
Since two of the three of those crops produce their own nitrogen, it will only be necessary to add a bloom formula with no nitrogen at all. Raw potassium phosphate is fine, although, you will want to add trace minerals as well.
I usually don't recommend any particular brand or items, but in this case I will. Foxfarm makes a nutrient line of bloom boosters. You will only need one of these. It is called BeastieBloomz. This is a super concentrated phosphorous and potassium blend with no nitrogen.
You will want to use this at 1/4 strength that it recommends on the packaging. The results will speak for themselves.
Again, I usually wouldn't recommend this, but in your situation, you must be careful how you feed this arrangement, so I felt that the answer was warranted.
Why is sandy, acidic soil better for butterfly peas? What is the ideal ph for butterfly pea. If I use a lower acidity soil, like a 6.5, will the plant be affected in any way? And if yes, how so?
Sandy, and acidic soil will mimic its native environment. This means that it will be in its ideal condition for growth, however, they can do just fine in just about any soil. 6.5 is just fine, and can even be brought to 6 and it would be just fine. I would stay away from alkaline soils. Although they can grow in it, this would not be ideal.
Here is an article for more information: https://www.gardeningknowhow.com/ornamental/flowers/butterfly-pea/planting-butterfly-pea-flowers.htm
I can buy actually pea seed packets but I was just curious.
These were not dried or prepared properly for planting, so they are already likely sterile. I recommend drying your own fresh peas, or planting them from a packet of seeds.
I'm new to upside down gardening and since it's early spring, I've started with a pea. It's growing vigorously, but UP the side of the container. I'm worried that either it is going to continue upwards or that, without supports, when it gets heavier, it will break. Should I be trying to train it down? I already have a supplementary light source below it. But it seems so happy defying gravity.
Gravity is an integral part of how plants function, from the transportation of hormones to signalling hormone changes.
The "topsy turvey" method is, simply, a novelty with no real utility in the garden.
You will be fighting gravity until the very end, or trying to find a way to supplement gravity in the opposite direction.
I am growing these as micro greens and the leaves are just not opening properly. I am not sure why .
Oh thank you for the answer and link, both were helpful. I am thinking they may be lacking water and so gave them a good dose tonight with the intention to harvest tomorrow. I normally don’t like to keep them too moist in an effort to avoid damping off and mold. We will see tomorrow. Thanks again!
Micro-greens may not look like the garden variety. For one thing, they are being grown so closely together that they interfere/compete for water and nutrients. Secondly, they cast shade making plants to unusual things to reach the sun. To me, your plants look fine for that environment. In fact, they look ready for harvest. The following article discusses growing micro-greens: https://www.gardeningknowhow.com/edible/vegetables/lettuce/growing-microgreens.htm
Those appear to be green beans! That can happen when there is a little too much nitrogen in the soil and not enough phosphorus and potassium. Additionally, hot weather can cause green beans to do what you are seeing there. They do best in coolers weather.
Here is an article that will help you to get the most out of your green bean plant: https://www.gardeningknowhow.com/edible/vegetables/beans/tips-for-growing-beans.htm
Leaves are turning brown already
It would be hard to say for certain without seeing the damage. I can take a few guesses and give you information on curing common issues with them, however.
Most likely, the symptoms are describing a fungal infection. This will need to be treated with a fungicide. Most of the time, this occurs from the soil remaining too wet for too long without a drying out between watering.
Less likely would be a combination of deficiencies such as iron, phosphorus, and potassium.
Here are a few articles that will help you:
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
https://www.gardeningknowhow.com/edible/vegetables/peas/pea-plant-diseases-and-pests.htm
https://www.gardeningknowhow.com/edible/vegetables/peas/how-grow-peas.htm