I have one tomato plant that is still very small but is getting flowers on it already, should I snip the flowers off until the plant is larger, my other tomato plants do not have flowers on them yet
You can remove flowers on the tomatoes until they reach about 12 inches in height.
How do I know if I am either over or under watering a tomato plant in a planter?
You will need to check the soil.
The soil should be a good commercial container mix.
Soil should be moist, never dry or never soggy.
This article has more information.
https://www.gardeningknowhow.com/edible/vegetables/tomato/growing-tomatoes-pots-containers.htm
Will wood mulch harm tomatoe plants?
This article will help you with mulching of tomatoes.
https://www.gardeningknowhow.com/edible/vegetables/tomato/mulch-for-tomatoes.htm
I grew up with tomatoes being spaced 24"-36" apart. However, in our very small plot, they are planted closer together, about 15", with tall cages. I have them in rows 15" apart as well. Some of the indeterminates have just-starting-to-yellow lower leaves. Is this likely caused because of being too close together? Is there a way to save the plants? Sabina
Lower-level leaves that turn yellow-to-brown on tomato plants isn't always a sign of disease in the plant or a failure that requires "saving." You've got plenty of space between them so if the rest of the plant is healthy and growing, the lower leaves simply may not be getting as much sunshine as the rest of the plant. That's usually not the case until the plant is pretty mature, though, so take a look at other possible reasons here:
https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm
Hi there,I am not sure if it is ok to fertilize Tomato bushes with chemical fertilizer while they are fruits on it, cause I'm concerned that the fruits will be affected by the chemicals in the fertilizer and then they wouldn't be edible anymore or maybe dangerous for human health,is it a valid concern or its just me being paranoid about it,thanks
Fertilizing the soil AROUND the plant (about 6 inches away) with any chemical fertilizer won't harm the fruit at all. This article may help you: https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-fertilizer.htm
What are black spots (do not have yellow rings around them) on tomato leaves? Black spots appear along veins in leaf.
If the spots are distinctly only on the oldest leaves, your plant may be suffering from Septoria Leaf Canker, but there are numerous other possibilities. These articles may help you identify the issue and treat it appropriately:
https://www.gardeningknowhow.com/edible/vegetables/tomato/septoria-leaf-spot.htm
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-plant-problems.htm
How can I find out what it from
Unless you see the culprit or culprits it is difficult to identify the insect or caterpillar.
Most insects can be controlled with an application of Neem Oil. Neem Oil is organic and is safe for people, pets and bees.
Here are some articles that will help you.
https://www.gardeningknowhow.com/plant-problems/pests/insects/holes-in-plant-leaves.htm
https://extension.entm.purdue.edu/publications/E-65.pdf
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/homemade-soap-spray.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm