There are far more variations in plants then all land animals. So some are asexual, some are sexual, and some can be both. Most plants do have the ability to sexually reproduce. Plants do not generally touch when having sex. Older plant species would just spread their pollen into the wind and hope it lands on the seeds of a different plant. In order to increase their chances plants produce a lot of pollen and this can create air quality issues as the air becomes filled with pollen. Later on a branch of plants formed a symbiose with insects. They lures the insects close with colourfull flowers and sweet nectar and then cover the insects with pollen. The insects will visit flowers of other plants where the pollen will fertilise the seeds. This is much more efficient then just spreading the pollen to the winds. But both of these forms of sexual reproduction is used by plants today, as well as some more exotic forms.
But even plants which rely on sexual reproduction can typically reproduce asexually. If you split a plant in two it can usually grow from both halves. A common technique is to take a branch from one plant and then plant it and it will form a new plant. But most plants will still be able to sexually reproduce as well.
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