What's your question? Ask

Sure, as long as it is dolomitic lime, there is no issue with this. Hydrated lime is a little more reactive, so if this is what you have, you may want to apply this first. It will break down rather fast, so a few weeks later you can apply your weed and feed.

Fertilizing with a slow release fertilizer for most trees and shrubs can happen at planting. I like an 18-18-18 granular slow release fertilizer.

Perennials can be also fertilized in the spring.
Potted plants can benefit from a second application in July.
Always follow directions on the packaging.

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/what-is-balanced-fertilizer.htm

Without knowing the product's details, I can't say one way or another. Products like Hollytone, a weak, balanced organic fertilizer can be applied at different rates depending on the season and the target plant. Trees and shrubs don't need much fertilizer; a few inches of compost if usually enough. Annuals and vegetables have a faster growth rate and need a nitrogen boost mid summer, particularly tomatoes, corn and other "heavy feeders". Fertilizing in fall should be at half the normal rate and applied no later than 6 weeks before first frost is expected. This helps plants "shut down" and prepare for winter. Fertilizer too late in the season is one cause of winter die-back. This website has many articles on fertilizers and which and how much to use for different plants. https://www.gardeningknowhow.com/search?q=fertilizer

It is hard to say. It could be environmental reasons such as weather. Maybe there were lots of storms that brought rain for green-up but hindered the pollinators. Or you say the plants/trees have been there for years. Perhaps nutrients have become imbalanced without proper fertilization.
A soil test could indicate those issues. Your local cooperative extension agent can help with that or you can purchase kits in garden centers.
Here is more information:
https://www.gardeningknowhow.com/plant-problems/environmental/plant-not-blooming.htm

Most plants benefit from slow-release fertilizer granules added per product instructions, usually once or twice a season.

You don't specify whether you have ornamentals or vegetables, but a soil test can identify the nutrients your soil may lack. You can do that through your local cooperative extension agent. They also have online and in-office fact sheets with all the information you need to grow annuals, perennials, trees, shrubs and vegetables.

You also can search this website for how-to information on just about any plant. Here is information on fertilizer and organic soil amendments:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/best-times-to-apply-fertilizer.htm

https://www.gardeningknowhow.com/special/organic/the-importance-of-soil-for-an-organic-garden.htm

This type of fertilizer is best for leafy plants and heavy feeding plants.
These include tomatoes, potatoes, garlic, leeks, and any plant in the brassica family.

https://www.gardeningknowhow.com/edible/herbs/nettle/nettle-as-fertilizer.htm