Is it safe to apply weed killer to soil before planting vegetables? What type is best?
Almost all weed killers have a period of time after which where it is safe eat food grown in them. The time varies. Organic solutions may take longer to kill the weeds but are less costly and have a shorter time for safe consumption. Chemical controls tend to be more effective but will take longer to fade.
In short, really they are all technically safe. Which you use in your garden is a personal choice.
What kind of salt (table, iodine, rock) can be used to control weeds in the spring?
Any kind can be used, but be careful when using it. A salted area will not grow anything, including the plants you want to grow.
How long will the corn meal last for the weed killer before I have to add more to the soil? Looking for a pet friendly weed killer.
Corn meal acts as a pre-emergent, meaning it will prevent weeds from germinating but will not kill weeds already growing. I would reapply it monthly.
Last year I started a flower and vegetable garden on my existing lawn. I tilled the area very thoroughly but still fought the invasion of grass throughout the year. Is there anything I can treat this area with that will kill the grass but not harm the vegetables or flowers? I have tilled the area thoroughly in preparation for planting this weekend. Also, if there is something I can use , should I continue using it after planting to control the spread of grass?
You may want to consider planting a no-dig garden. This provides the same benefits as a traditional garden but without the hassle of digging or tilling...and is great for knocking out those pesky weeds, especially unwanted grass.
Here is an article or two that you may find helpful: https://www.gardeningknowhow.com/special/starting/how-to-build-a-flower-bed-starting-a-flower-bed-from-scratch.htm
https://www.gardeningknowhow.com/special/urban/raised-beds-for-urban-settings-no-digging-required.htm
After applying corn meal as a pre-emergent, how soon can you plant seeds?
The recommended wait period (before seeding) when using corn gluten meal is usually 4 to 6 weeks - that's the period the gluten is effective. I would imagine that regular corn meal would be about the same.
I just tilled out a spot for my garden. What should I do to keep the grass from coming back up?
Many people like to use weed barrier cloth in their garden to keep the weeds down. If that is not appealing, mulching around your plants as you plant them will also keep the weeds down.
How do I kill Ivy and Bamboo without harming other plants?
These articles will help you:
https://www.gardeningknowhow.com/ornamental/foliage/bamboo/kill-bamboo.htm
https://www.gardeningknowhow.com/ornamental/groundcover/english-ivy/kill-english-ivy.htm