The Grimoire is operated by DiceBard.com, Dice Bard has everything you need to play 5e... as long as all you need to play 5e is dice.

Plant Growth 3rd level transmutation

Casting Time: 1 action or 8 hours

Range: 150 feet

Components: V, S

Duration: Instantaneous

Tags: bard druid ranger level3 transmutation

This spell channels vitality into plants within a specific area. There are two possible uses for the spell, granting either immediate or long-term benefits.

If you cast this spell using 1 action, choose a point within range. All normal plants in a 100-foot radius centered on that point become thick and overgrown. A creature moving through the area must spend 4 feet of movement for every 1 foot it moves.

You can exclude one or more areas of any size within the spell’s area from being affected.

If you cast this spell over 8 hours, you enrich the land. All plants in a half-mile radius centered on a point within range become enriched for 1 year. The plants yield twice the normal amount of food when harvested.

You can find more information on this spell in: PHB.266