I started my petunia plants from seed indoors. Once they had their true leaves, I transplanted them into peat pots. They are now getting bigger and I am wondering if I have to transplant them into a larger pot or if I am to just leave them alone and let them do their own thing. They seem to be getting taller and have only grown a few more leaves. Do I cut them back to encourage growth width wise?
When the seedlings reach 6" in height, pinch back the main leader to promote new side shoots.
Make sure your seedlings are receiving a good amount of sunlight. At least 6 hours a day.
https://www.gardeningknowhow.com/ornamental/flowers/petunia/wave-petunia-plants.htm
I am starting my petunias from seed. They are starting to put buds on. Do I need to pinch the first one off to encourage more growth?
Wait until your plants are about 6 inch high. You can then pinch back to promote branching and fuller plant.
If I just pull the dead flower off, will that make the plant create a seed pod, which is what I want to do on some of the plants so I have seeds? I rarely get a seed pod, so if I pull the flower off rather than cutting the whole thing off, it will not create a new flower in that exact place, correct?
When you deadhead a petunia you encourage more blooms and discourage the formation of seed pods. If you stop deadheading the petunias, the seed pods will form naturally. When the bloom fades and dies, the seed pod will begin to develop.
For more information on deadheading petunias, please visit the following link:
https://www.gardeningknowhow.com/ornamental/flowers/petunia/deadheading-petunias.htm
Shall I cut my petunias way back now in the spring? They're looking brown underneath, but there are sill blooms on the long stalks. Thank you.
What is looking brown underneath - the stems or the leaves? If your petunia plant is bushy, they may not be receiving enough light, or your plant may just be getting very mature. Petunias can be pruned anytime. You can deadhead them (https://www.gardeningknowhow.com/ornamental/flowers/petunia/deadheading-petunias.htm) or you can prune them back severely to encourage new shoots and flowers to develop.
Are wave petunias good in window boxes?
Why do my petunias get black spots on the leafs, what can i do
This is a disease called black spot. This article will help you:
https://www.gardeningknowhow.com/plant-problems/disease/black-spot-fungus.htm
My petunia leaves have turned yellow and some of the flower buds have turned brown. The under growth looks healthy. Flowers continue to bloom, but not as much as they use to. I have 2 white petunias and one purple petunia in the pot and 2 white petunias and one pink petunia in the other pot. It only seems to be effecting the white petunias, not the colored petunias. I feed all of my petunias every other day with miracle grow and water. I finally cut the yellow leaves off because I was afraid they had something wrong with them.
You are watering regularly, but do you check the soil before doing so?
The plants should be kept moist but not soggy.
Weekly fertilizer would be a good schedule.
You will have smaller blossoms and less flowers in a more shady location and more flowers in bright sun.
Dead head the old blossoms to encourage more flowering.
Here are a couple of great articles.
https://www.gardeningknowhow.com/ornamental/flowers/petunia/petunia-care.htm
https://www.gardeningknowhow.com/ornamental/flowers/petunia/deadheading-petunias.htm