Cannabis Clone Health Inspection Checklist Before You Buy

A cannabis clone health inspection checklist comes down to four checks: roots, foliage, stem and crown, and the pests that hide on leaf undersides. Run all four in bright light with a magnifier before you pay for the plant, then quarantine it away from your garden for at least a week.

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The Four-Point Cannabis Clone Health Inspection Checklist

• Roots: white or off-white, firm, and holding the plug together
• Foliage: even color, no spots, no mottling, no curling or cupping
• Stem and crown: firm base, no dark sunken lesions at the medium line
• Leaf undersides and medium: no mites, eggs, webbing, gnats, or algae

Roots Tell You the Most

Ask to slide the clone out of its plug or cup. Healthy roots are white and reach through the medium without circling the walls. Brown, mushy, or foul-smelling roots point to root rot, which usually follows overwatering and poor drainage. A clone with damaged roots can recover, but it starts your grow behind and may carry pathogens into your room.

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Read the Leaves, Top and Bottom

Top growth should look flat and consistent in color. Yellowing between the veins, brown spots, or a cupped shape can signal a nutrient problem, a pH issue, or early disease. Turn every leaf over. Two-spotted spider mites, their eggs, and fine webbing sit along the midrib and in the creases. Thrips leave silvery streaks and black specks. Either pest on a nursery plant becomes a room-wide problem within a few weeks.

cannabis clone health inspection checklist

Check the Stem, Crown, and Medium

Look at where the stem meets the medium. A healthy crown is firm and unmarked. Dark, sunken tissue there suggests damping off or a stem rot that will collapse the plant soon. Squeeze the plug lightly: soggy medium, algae on the surface, and fungus gnat adults on the rim all suggest the clone was kept too wet. Powdery mildew appears as white dust on leaf surfaces and travels easily on a plant you never inspect closely.

Questions to Ask Before You Pay

• How old is the mother plant, and what is her health history?
• Has this variety been tested for pathogens such as hop latent viroid?
• What light schedule and nutrient strength is the clone used to?
• Is it rooted in rockwool, peat, or coco?

Red Flags That Mean Walk Away

Skip the plant if you see active mites or webbing, brown mush in the root zone, white powdery patches on leaves, or a soft dark stem base. Pass as well when the seller will not let you lift the plug or look under the leaves. A cheap clone that carries pests costs more than a clean one.

Quarantine After the Inspection

Once a plant passes, keep it apart from your main garden for seven to ten days. Watch for new spots, leaf curling, or flying insects during that window. Run this cannabis clone health inspection checklist again on day seven before the plant joins the group. Clean your hands and tools between plants so an inspection does not move pests around your own space.