. Epsom salt helps improve flower blooming and enhances a plant's green color. It can even help plants grow bushier. Epsom salt is made up of hydrated magnesium sulfate (magnesium and sulfur), which is important to healthy plant growth.
And hydrogen peroxide can give plants a boost:
While it has also been used as a general “fertilizer” either added in during watering or sprayed onto the foliage, hydrogen peroxide is not fertilizer, but it can help boost plant growth. How exactly? Hydrogen peroxide helps encourage healthy root growth because of the extra oxygen molecule. Oxygen can help plant roots absorb nutrients from the soil. Therefore, this extra bit of oxygen better enables the roots to absorb more nutrients, which means faster, healthier, and more vigorous growth. And as a bonus, hydrogen peroxide can help discourage unwanted bacteria/fungi that may be lurking in the garden.