can add another +1 to either CON, CHA, DEX, or INT depending on subrace

As a sprouting seed, they grow within the bulb of a particular flower for about 5 years depending on the favorability of the soil, after which they sprout into their "mature" state. They can live up to 750 years before returning to the earth from which they were born

Can range from Chaotic Good to Chaotic Evil, sometimes from Neutral Good to Neutral Evil and rarely ever Lawful Neutral to Lawful Evil, there have been very few cases of a Lawful Good Alraune 

Alraune can range from 4 to 6 feet and from 80 to 140 pounds

They have a walking speed of 30 and a swimming speed of 15, as well as a burrowing speed of 10 if they are in favorable soil (up to DM discretion)

Your creature type is considered to be both humanoid and plant, and you can attempt to hide even when you are only lightly obscured by foliage, heavy rain, falling snow, mist, and other natural phenomena. However, you are vulnerable to fire damage

They can root themselves in the favorable soil, remaining semiconscious, for 4 hours a day and absorbing nutrients from the soil. After resting in this way, you gain the same benefit that a human does from 8 hours of sleep. However, if the soil is not favorable you require a full 8 hours of rest to gain the equivalent of a long rest. Rooting yourself requires an action and can only be done on a patch of soil. While in this state your speed becomes 0 and you can uproot yourself as a bonus action.

The alraune produce a powerful pollen with an innate property pertaining to each subrace. As an action, you can release a puff of pollen in a 10-foot radius around yourself as well as in a 20-foot cone in one direction except for behind you, forcing all creatures in that range to make a Constitution saving throw. The DC for this saving throw equals 8 + your Wisdom modifier + your proficiency bonus. On a failure, they come under an effect dependent on your subrace for 1 minute. An affected creature can repeat their saving throw each time they take damage. You can use your pollem 5 times and once you use your pollen for the 5th time, you can't use it again until after you finish a long rest.

You have proficiency in the Nature skill as well as the Survival skill

The languages are Common and Sylvan

You can choose between Sunflower, Rose, Venus, or Violet

You can breath underwater indefinitely, and as  long as you are submerged in said water, you heal 1d20 health every minute. If you are attacked with any spell or weapon, regardless of if it is bludgeoning, pircing, slashing, or anything of that sort, as long as it has any type of water, ice, or cold damage, you heal rather then taking the damage (i.e. a ice sword that does 1d6 Slashing + 1d4 Ice, you heal 1d6 + 1d4 instead). If you are passing through a stream, a river, or a waterfall, you also heal. Snow, Mist, and Rain will also heal you. The health you regain is up to the DM's discretion. Also water based attacks are made against you with advantage, again, up to DM's discretion 

The Alraune have an innate ability to call on the will of nature, changing their form, not to that of an animal, but that of a actual plant. As an action you can change your form to any creature that is a plant as long as they are of the same challenge rating as you or lower. When you polymorph you take the stats and health of the plant based creature as well as all of their attacks. You can only use Neptune's Favor as long as you are in the form of said creature. All other racial traits are nullified for the duration. It lasts for 2 hours, until dispelled by wish or dispelled magic, or until your hit points drop to 0.

You have learned to "walk" in and out of foliage. While you are in an area of heavy foliage, you may use your bonus action to teleport into another area of heavy foliage within 30 ft.

After you have used this feature a number of times equal to double your proficiency bonus, you must finish a short or long rest to regain all expended uses.

You, being the little sneaky plant you are, have an Innate ability for sneaking and stealth, which pays off in more ways than one. As a racial feat, you can choose to either add 2d10 or 5d6 sneak attack damage to your attack rolls, using the rules on the rogues sneak attack. This ability stacks with that (i.e. a level 10 rogue with 5d6 sneak attack adds the 5d6 or the 2d10 on top of that.)