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How Big Will My Koi Grow?

July 29, 2025

Adult koi in a well-maintained garden pond typically grow to be 18 to 24 inches long (about 1.5 to 2 feet). Some can even reach up to 36 inches (3 feet) if they have:

Plenty of space

Clean, well-filtered water

Good nutrition

Consistent care

Quick Koi Growth Facts:

First year: Usually reach 6–8 inches

By age 3: Can be 12–18 inches

Full size (5+ years): Around 18–24 inches average

Larger koi are more likely in ponds over 2,000 gallons with minimal crowding. In smaller backyard ponds (say 500–1,000 gallons), they may stay a bit smaller but can still thrive and grow impressively.

Salvador G.

Salvador G.

Mowing Crew Member

Salvador began working with Damascus Enterprises, Inc. in March 2017.

Noe G.

Noé G.

Landscape Crew Member

Noé began working with Damascus Enterprises, Inc. in July of 2020.

David R.

David R.

Landscape Crew Member

David began working with Damascus Enterprises, Inc. in March of 2019.

Fredi O.

Fredi O.

Landscape & Mowing Crew Member

Fredi began working with Damascus Enterprises, Inc. in March of 2003.

Miguel B.

Miguel B.

Mowing Crew Leader

Miguel began working with Damascus Enterprises, Inc. in June 2014.

Nelson H.

Nelson H.

Landscape Crew Leader

Nelson began working with Damascus Enterprises, Inc. in March 2019.

Arturo D.

Arturo D.

Landscape Crew Leader

Arturo began working with Damascus Enterprises, Inc. in September of 2011.

Antonio S.

Antonio S.

Landscape Crew Leader

Antonio began working with Damascus Enterprises, Inc. in March 2001.

Mark Q.

Mark Q.

Pond Manager

Mark began working with Damascus Enterprises, Inc. in September 2010. Mark holds the following certifications; Aquascape Academy Certified, Maryland Certified Pesticide Applicator, and Maryland Certified Fertilizer Applicator.

Shawnee T.

Shawnee T.

Office Assistant and Customer Care

Shawnee began working with Damascus Enterprises in April 2021.

Mike B.

Mike B.

Landscape Designer, Plant & Lawn Care Specialist

Mike is a 3rd generation landscape professional and has worked in the field of horticulture for over 20 years. He has an AAS degree in landscape technology from Montgomery College. Mike is a Certified Professional Horticulturist through the Maryland Department of Agriculture and Landscape Industry Certified in softscape, and hardscape installation certified through PLANET. Mike began working with Damascus Enterprises, Inc. in February 2014. 

Scott Brown

Scott Brown

President / Owner

Damascus Enterprises, Inc. was established by Scott in 1998 as strictly a landscape company. Under his leadership and through continued training the business has grown and expanded to now offer a full array of services that include pond and waterfall installation and maintenance, lawn care, landscape design, custom stonework, and outdoor lighting.Scott is an Aquascape Certified Contractor, Vista Certified Design & Installation Specialist and regularly attends industry education and networking events like Pondemonium and Pondeminium. He has previously been recognized as a top young entrepreneur by Maryland’s Governor and the Small Business Association. He currently serves on the board of Montgomery County Farm Bureau and is Co-chair of the entertainment committee of the Montgomery County Agricultural Fair and is involved in the Damascus community through various activities. Scott and his wife Melody live in Damascus with their two children.