What if the leaves on my ficus tree are turning yellow and falling off?

That's the first sign the roses are dying. Give it water if it hasn't gotten enough, and maybe add some compost for nutrients.

It could be due to either a lack of water or nutrients. Try watering your peppers more frequently. If that doesn't correct the problem, add some nutrients to the soil.

Make sure it's getting enough water and 6 - 8 hours of sunlight per day. You could also try giving it fertilizer once a week.

Either way is fine. Boiling with the stems will help the tea turn pink if you add lemon juice.

This will happen if the paper you are using is too small so you should use a bigger piece of paper.