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It does sound like you need to transplant. This article will help you with that:
https://www.gardeningknowhow.com/ornamental/bulbs/iris/dividing-transplanting-iris.htm

It should be ok to go ahead and replant them now to a more suitable location.

With these weeds, persistence and diligence are the keys. You have 2 options. The first is to keep a close eye on the beds and snip the weeds off at ground level as soon as you see them appear. These repeated attempts to regrow will eventually result in the plant using all of its energy reserves in int roots and dying.

The other thing you can do is use weed barriers. Layers of newspaper, landscaping cloth and even thick layers of mulch can act as barriers. This will prevent the weeds from getting light and they will die from a lack of sunlight.

The most common reason for irises failing to bloom is overcrowding. Dividing and transplanting them usually helps. In addition, it can be attributed to poor pollination. Try to entice pollinators (bees, butterflies, etc.) to the area with brightly colored flowers.

Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/bulbs/iris/dividing-transplanting-iris.htm

These articles should help: https://www.gardeningknowhow.com/plant-problems/weeds/getting-rid-white-clover.htm
https://www.gardeningknowhow.com/ornamental/bulbs/violet/kill-wild-violets.htm

Note: To prevent harm to iris plants, you should either pull them up by hand or spot treat carefully. Boiling water can also help kill these and other weeds, but care should still be taken as to not get any on the irises.

A high phosphourus fertilizer, like bone meal, can be applied to irises if non-flowering is an issue.

Yes, gardenias can be planted outdoors in your area. The best time to transplant Iris is 2-3 weeks after the finish of blooming.