When does French marigold flower?
In June–October; the flowers are yellow, orange, red or brown.
When do I sow French marigold?
In February–May (direct sowing, sow indoors).
Does French marigold tolerate shade?
It tolerates part shade (3–6 hours of sun), but not full shade.
How much space does French marigold need?
At maturity 5⅞ in–1 ft 5¾ in wide and 5⅞ in–11¾ in tall; recommended spacing 9¾ in.
Powdery mildews — what can you do?
Destroy fallen infected leaves in fall; do not over-feed, and protect from drought (stress invites powdery mildew). Prune out infected shoots early and destroy fallen leaves.
Gray mold — what can you do?
Reduce humidity, improve airflow and do not plant too densely. Quickly remove dead and affected parts (carefully, as spores spread easily), ideally into a bag.