A brown dropper bottle labeled Plant Therapy Rosemary & Castor Hair Oil with a green graphic and text indicating it is a 4 fl. oz. (118 mL) hair treatment. A brown dropper bottle labeled “Plant Therapy Rosemary & Castor Hair Oil” is centered in a teardrop shape, with close-up images of castor plant on the left and rosemary leaves on the right. Text on a green background about 3,000 banned ingredients and a higher standard for home products.
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A brown dropper bottle labeled Plant Therapy Rosemary & Castor Hair Oil with a green graphic and text indicating it is a 4 fl. oz. (118 mL) hair treatment.

Plant Therapy Rosemary & Castor Hair Oil

4 oz

Why we love it

  • Free from 3,000+ banned ingredients and meets our EU-informed standards.
  • Combines the benefits of Castor oil with a refreshing Rosemary scent.
  • Uses Sweet Almond oil for even smoother, shinier strands.
  • Only contains three clean, simple ingredients for healthier hair.
Scent: Rosemary
Purchase options

Rosemary & Castor Hair Oil $15.99

Free carbon neutral shipping on orders $29+. Arrives in 3–5 days. Free, easy 30-day returns.

So you’ve probably heard the buzz about Castor - healthy, strong hair plus boost new growth? Check! It is GREAT, but if you haven’t tried it yet, we’re going to let you in on a little secret: it’s thick and sticky with a natural smell that, well, leaves something to be desired. Our solution? Combine Castor Oil with other hair-loving botanicals. Meet Rosemary & Castor Hair Oil! Packed full of Castor’s happy hair benefits - but better! We’ve blended Castor with Sweet Almond Oil to give this formula a silky soft feel and some added benefits (smooth, shiny strands!), and the scent? You’ll love the fresh, herbal notes that Rosemary Essential Oil provides, plus it supports hair growth and a healthy scalp. What could be better? Three clean, simple ingredients for gorgeous hair you’ll love! You can thank us later!

Prunus Amygdalus Dulcis (Sweet Almond) Oil, Ricinus Communis (Castor) Seed Oil, Rosmarinus Officinalis (Rosemary) Leaf/Stem Oil.

Pre-Wash: Fill the dropper with oil and apply directly to your hairline. Gently massage into scalp. Apply more or less as needed. Leave in for 30 minutes (or overnight if desired) and wash out with shampoo. Leave-In: Add a few drops of oil to your fingertips and rub together. Apply oil evenly through clean strands, focusing on the ends.

A little goes a long way, so use sparingly to achieve desired look.

Grove Values

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3,000+ BANNED INGREDIENTS

Personal care with nothing to hide.

From head to toe, every product is screened for ingredient safety, material impact, and unnecessary waste — so you can feel more confident in what touches your body every day.

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Strictly screened ingredients

Including parabens, PEGs, sulfates, phthalates, and synthetic fragrance

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Cruelty free

Every personal care brand we offer is committed to cruelty-free practices

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Less plastic, fewer microplastics

Refillable and reduced-plastic options that lessen waste and microplastic exposure

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Go Beyond Plastic™ and microplastics.

Plastic products break down into microplastics that can affect human health.

Grove Co. is on a mission to reduce plastic in home essentials — for both people and for the planet.

Learn more on the Home Planet blog