Micranthemum Micranthemoides Pearl Weed

$7.99

Usually ships in 1-2 business days from our fulfillment center

Few aquarium plants are as flexible as Micranthemum Micranthemoides, aka Pearl Weed. This longtime hobby favorite develops tiny, bright green leaves along fine stems that can be trimmed in any shape you can think of. Keep it pruned low for a dense foreground or creeping mass, shape it into rounded midground bushes, or let the stems gain height to create a soft green background.

Its size and flexibility make Pearl Weed especially ideal for nano aquariums. Under stronger lighting, growth becomes more compact with shorter spacing between leaves and increased branching. In open areas, stems may even begin creeping horizontally along the substrate. Lower lighting tends to produce longer, leggier growth instead.

Pearl Weed is also quite forgiving. It grows without CO2 injection, tolerates a wide range of aquarium conditions, and can access nutrients through the substrate and water column. Once established, don't let its tiny leaves fool you—this plant grows rapidly. Regular trimming encourages more branching and is the key to developing the dense, manicured bushes Pearl Weed is known for.

Why So Many Names?

Pearl Weed has traveled through the aquarium hobby under several scientific names, including Micranthemum micranthemoides and Hemianthus micranthemoides. More recent botanical identification recognizes Hemianthus glomeratus, although the older names remain widely used on plant labels and throughout the aquarium trade.

Pearl Weed should not be confused with Monte Carlo (Micranthemum tweediei), another small-leaved aquarium plant with a distinctly different growth habit.

Aquarium plants can vary in growth form and may require time to transition to your aquarium environment, whether grown submerged or emersed. This transition period is a natural part of establishing healthy, long-term growth in planted aquariums.

From carpeting plants in the foreground to stem plants and larger species used in the midground or background, each plant offers a unique contribution to a balanced and natural aquascape. As plants adapt, it is normal to see minor changes such as leaf melt, color shifts, or new growth patterns as they settle into their new conditions.

We carefully inspect and prepare all live aquatic plants prior to shipping. While we do our best to minimize hitchhikers, we cannot guarantee plants to be completely pest or snail-free unless tissue culture options are selected.

Because live plants are perishable, some signs of transit stress may occur, including leaf loss or cosmetic damage. These are typically temporary and when when healthy roots are present, most plants will recover with proper care.

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Tissue culture aquarium plants are grown in sterile, laboratory conditions, ensuring they are free from pests, algae, and snails. These young plants are cultivated in nutrient-rich gel and are grown in emersed form before being introduced into the aquarium.

Tissue culture plants are best for aquascapers looking for clean, controlled plant material, especially for shrimp tanks or sensitive setups. Before planting, the gel media should be gently removed, and the plant can be divided into smaller portions for planting.

With proper care, tissue culture plants transition quickly and establish into healthy submerged growth.

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Micranthemum Micranthemoides $7.99

Aquarium Stem Plant Care Guide & Growth Cycle

Aquarium stem plants are fast-growing aquatic plants that develop leaves along a vertical stem and are typically planted into aquasoil or other nutrient-rich substrates. Popular in nature-style planted tanks, stem plants add vivid color and grow quickly, filling in background and midground areas easily. Common genera include Alternanthera, Bacopa, Ludwigia, and Rotala, with species suitable for both low-tech aquariums and high-light, CO2-injected layouts. This guide outlines stem plant care and the growth stages you can expect from initial planting through trimming and long-term maintenance.

Planted aquarium with overgrown aquatic stem plants

Trimming and maintenance of aquatic stem plants in densely planted UNS 45U Iwagumi aquascape

Completed maintenance on densely planted Brazilian Iwagumi aquascape with Rotala stem plants

Before

Trimming and Replanting

After

Glass Aqua Planted Aquarium Tank Aquatic Stem Plant Trimming Guide

Trim aquarium stem plants by cutting the stem

After trimming, the rooted portion can remain in place or be removed

New shoots will grow from the node where the stem was cut

Alternatively, replant the healthiest trimming to propagate new stems

Repeating this process encourages denser, bushier plant groups

Stage 1: Adaptation and Recovery (Months 1–2)

After planting, stem plants enter an adaptation phase as they adjust to their new environment. Water parameters, transit stress, and the form in which the plant was grown all influence how smoothly this transition occurs. Today, aquarium plants are available in several variations including tissue culture, submerged stem bunches, or emergent-grown bunched or potted plants. Each form requires a different amount of time to acclimation and transition to fully submerged growth.

During this stage, some leaf melt, slow growth, or discoloration can occur. Sensitive species such as Cabomba or Nesaea take longer to stabilize and can drop leaves even from gentle handling. Even hardy plants will need to adjust to differences in CO2 levels, nutrient availability, and lighting levels in a new aquarium.

Adaptation is generally much smoother when stem plants are introduced into a cycled, stable planted tank. In aquariums that are still finding balance, plants are more likely to struggle and show visible damage when trying to establish. Stability during introduction is key. Avoid frequent uprooting or major adjustments while roots are developing and new submerged growth appears.

Aquarium stem plants 1 month growth in Brazilian style Iwagumi aquascape by Glass Aqua

April 6th — Just over one month of growth with little coloration in the stem plants

Growth progress of stem plants without coloring up yet in planted aquarium

May 21st — Stem plants are beginning to take off, but coloration has not fully developed yet

Side view of stem plant growth in Brazilian Iwagumi aquascape by Glass Aqua

May 31st — Slight melt appears in the lower, older portions of the stems as the plants transition to new growth

Stage 2: Active Growth and Trimming (Months 2–5)

Once a stem plant has adapted, it will begin producing new shoots, leaves, and visible roots. This is a great sign that the plant has transitioned successfully and is entering an active growth phase. You can now begin monitoring older growth more closely.

If you started off using a high-quality aquarium soil like Ultum Nature Systems Controsoil or Aquario Neo Soil, major deficiencies are uncommon at this stage. However, older leaves may melt, fade in color or deteriorate as the plant sheds non-adapted growth in favor of new submerged foliage. If this happens, trim the healthy new tops and replant it into the substrate. This allows the plant to redirect its energy and focus on new growth rather than attempting to recover or sustain older leaves that will naturally decline over time.

Because stem plants absorb nutrients through both their roots and leaf tissue, regular fertilization becomes increasingly important as the plant matures and growth accelerates. A nutrient-rich substrate will support root development, while liquid fertilizers provide nutrients via the water column.

Aquarium stem plants beginning to gain color in Brazilian aquascape by Glass Aqua

June 21st — The stem plants are starting to color up, but the group has not yet been "shaped"

Trimming colorful aquarium stem plants and replanting for better growth in planted tank

July 6th - The stems now have color and have reached the surface. This area is now trimmed and shaped

Replanting colorful and healthy stem plant trimmings for better growth

July 6th - The healthiest and most colorful trimmings are replanted in between for denser growth

Stage 3: Maintenance (Months 6–8)

At this stage, plants are happy and will continue to grow well as long as the planted aquarium remains balanced. Weekly water changes, consistent liquid fertilization, and stable CO2 levels are key. As stem plants grow larger and taller, regular trimming may become necessary to ensure even light penetration throughout the group. You can trim excess growth and replant healthy tops to achieve the bushy, dense growth that many aquascapers aim for! Aquascaping tools will make this trimming and replanting job easier and more comfortable for you.

You may also start to notice aerial roots. These fine roots emerge from stem nodes and develop naturally thanks to natural propagation instincts. If these roots make contact with the substrate, congratulations you have a new plant! They’re harmless, but if you prefer a cleaner look, replant fresh trimmings and remove old stems as needed. Because trimming encourages branching, aerial roots tend to appear more frequently in aquariums where stem plants are regularly pruned. It’s also best to prevent stems from reaching the water surface. When left to grow, most will naturally bend and continue to grow sideways, almost guaranteeing the formation of aerial roots.

It is now that root tabs might be a good move in addition to consistent liquid fertilization in the water column. Aquasoil gradually depletes over time, and root tab supplementation in areas with heavy plant mass will help replenish nutrients in the substrate for continued healthy growth. Plants are fantastic communicators, and nutrient imbalances can include pinholes in leaves, discoloration, deformed new growth, or slower overall growth. Adjusting fertilization and maintaining consistent maintenance routines will help keep the planted aquarium balanced as the layout matures.

Pearling Rotala stem plant in planted aquarium by Glass Aqua

Twinstar aquarium light growing colorful aquatic stem plants

Ludwigia super red sprouting aerial roots in nano planted aquarium

Ludwigia super red growing out of water in nano planted aquarium

Aquarium stem plant with aerial roots reaching down to substrate with other aquatic plants and Ember Tetras

Aerial roots and emergent growth from Ludwiga Natans 'Super Red'

Stage 4: Replant or Rescape (Months 8+)

As the planted tank matures, plant mass will eventually overtake the available space, leaving little room for new growth or root formation. Now is the time to decide whether to reset and replant certain areas or rescape the aquarium.

For a reset, start by trimming away older stems and uprooting dense plant areas. Top off with fresh soil and replant healthy trimmings as desired. Alternatively, start something entirely new. For aquascapers who enjoy periodic resets, this stage is a natural opportunity to redesign the layout and rescape the tank!

We hope that by the end of Stage 4 you either replant and repurpose your stem plants or share some with fellow aquascaping friends. Healthy stem plant growth ultimately depends on balanced lighting, nutrients, and CO2 levels working together to support beautiful aquascapes and stable planted aquariums.

Mature 9.3 gallon planted aquarium with colorful stem plants by Glass Aqua

Colorful Brazilian Iwagumi aquascape by Glass Aqua in the Ultum Nature Systems 45U standard rimless aquarium

Brazilian Style Iwagumi planted aquarium by Glass Aqua

Colorful aquarium stem plants before trimming in UNS 45U planted tank

Brazilian Iwagumi aquascape with red stem plants by Glass Aqua

September 15th — The final look of this Ultum Nature Systems 45U planted aquarium Iwagumi and a view through the aquascape’s lifecycle.

Overall rating: 4.6153846 / 5 from 13 reviews.

AI Generated Review Summary

Summary topics

Review topics: ["quality","looks","plants"].

Review highlights

Reviews

Pearl weed!

"The plants showed up in incredible condition! No browning, wilting, or unhealthy plants! Both containers I received were green and vibrant! Will Definitely be purchasing plants from here again!"

— Isaac B. (5/5)

Nice quality for tank

"Nice quality for tank"

— Janaan B. (5/5)

Very happy with amount and quality

"First time seeing this plant and wasn't sure what to expect. Love this little leafed plant! It is like Monte Carlo but not fussy and very easy to plant! I actually prefer the tiny leaves over Monte Carlo and adds a nice definition to the tank. This is a new tank set up about a month old and was planted about 2 weeks now. Thriving and starting to sprout up and spread. I just love the look it gives this new tank rescape!"

— Susan L. (5/5)

"Beautiful, healthy and packaged in secure containers. Every plant I get from glass aqua is exceptional."

— Susan (5/5)

"Melted! Please include an ice pack for hot weather or offer one for sale, and advertise it. The box it came in was ok, just shipping companies don't care. I know they looked gorgeous to begin with, pitty."

— Tyler (1/5)

Pearlweed

"Came in really good shape!! Having issues with everything melting about a week and a half in, but hoping that the roots are establishing and will grow back sometime this week more. Using a dirt bottom tank with 1 inch sand cap."

— Devin G. (4/5)

Micranthemum Micranthemoides

"Plant was delivered in perfect condition. Been in my quarantine/Grow Out tank for several weeks and has almost doubled in since. Very happy with this product!"

— David C. (5/5)

Perfect!!!

"lovely plants, came very healthy and bright :)"

— Lilly C. (5/5)

Good Plant

"Packaging was nice and plant is healthy."

— Jason S. (5/5)

Good and healthy

"They are in good condition. However, the bunch is a few stems (about 10 stems). It is not enough for my aquarium. Just add them to my tank and wait for them expand more and more."

— Trieu C. (5/5)

Q&A

Shipping
Orders are typically processed within 1-2 business days M-F. However, additional time may be required during peak seasons and federal holidays. For orders containing live plants, we exercise extra caution and assess factors such as travel distance and weather to ensure safe transit.

To avoid delays, please ensure all order information is accurate and complete. We cannot offer refunds and are not responsible for orders shipped to incorrect addresses due to errors in provided information. Once an order has been shipped, delivery times are determined by the carrier and are outside of our control. On average, shipments arrive within 2–5 business days, excluding weekends and holidays. For more information, please visit our FAQ page.

Returns
If you are not satisfied with your purchase, please contact us within 48 hours of delivery. Approved returns must be shipped back within 14 days of approval. Returned items must be unused, unopened, and in their original packaging. Specific return requirements, if applicable, will be listed on the product’s page. For more information, please visit our FAQ page.

Refunds
No worries, we’ll take care of everything as long as it fits the guidelines above.Most answers to general questions can be found on our FAQ page.