| Cover | Jan. 18, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 18, 2022 |
| Entity File Number | 333-207889 |
| Entity Registrant Name | GROWGENERATION CORP. |
| Entity Central Index Key | 0001604868 |
| Entity Tax Identification Number | 46-5008129 |
| Entity Incorporation, State or Country Code | CO |
| Entity Address, Address Line One | 5619 DTC Parkway |
| Entity Address, Address Line Two | Suite 900 |
| Entity Address, City or Town | Greenwood Village |
| Entity Address, State or Province | CO |
| Entity Address, Postal Zip Code | 80111 |
| City Area Code | (800) |
| Local Phone Number | 935-8420 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | GRWG |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
