Requires main game along with Dead Money, HH and OWB DLCs installed.
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Mod version 1.2
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You'll have 33% chance of an extra ingredient on plants and fungi.
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Banana Yucca               1 -> 2
Barrel Cactus                1 -> 2
Broc Flower                   1 -> 2
Buffalo Gourd Seed      1 -> 2
Cave Fungus(HH)         1 -> 2
Coyote Tobacco            1 -> 2
Honey Mesquite Pod    1 -> 2
Jalapeno Pepper           2 -> 3
Maize                              1 -> 2
Nevada Agave Fruit      2 -> 3
Sacred Datura Root (HH)      1 -> 2
Mutant Cave Fungus (OWB) 1 -> 2
Pinto Bean Pod          2 -> 3
Prickly Pear Fruit       2 -> 3
White Horse Nettle    1 -> 2
Xander Rood              1 -> 2
Jar of Cloud Residue (DM)   1 -> 2    (new in version 1.1)
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I also corrected their scripts so they will properly re-spawn fruits, leaves, etc. after 3 days.
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If you give it a try, you'll find some Prickly Pear Cacti near Harper's Shack.
Gather the fruits, wait for 3 days, teleport to Goodsprings, teleport back and see what happens.
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New in version 1.2
The scripts use less variables in counting the days passed starting from the last pick.
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Have fun.

Credits:
Obsidian/Bethesda
Kingdom Plantae
Delicious mushrooms.

Many thanks to:
Nexus - for allowing us posting our distorted ideas converted into mods.