Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to kill weeds [title] Determine the ideal height of your grass. [step] All lawns have an ideal grass height that promotes healthy growth. Depending on climate and geography, your ideal grass height is between 1/4 inch (0.635 cm) and 3 inches (7.62 cm).

Ending1: Grass heights can vary in different growing techniques, so it's important to measure your lawn's natural slope to determine whether it's level or uneven before you start your weed killer. [substeps] Most weed killers are mild and effective at killing weeds, but more aggressive to different grasses or shrubs. Ending2: In spite of this, some lawns may not be tall enough to prevent extreme frost. [substeps] A lawn that is not cultivated and maintained can be overgrown. Ending3: [substeps] Talk to a landscaping expert or a professional at your local home and garden retailer to get an understanding of the type of grass you have and how high it should grow. Keep grass a little bit longer when in doubt. Ending4: If you live in a temperate climate and consistently maintain a recommended lawn length, then you can calculate your lawn's height without needing to soil surability. [substeps] Make sure you factor in your local regulations when determining the ideal grass height.

Answer format: ending1/ending2/ending3/ending4