Guide
Getting carrots to germinate and grow straight
Carrots are slow to germinate and unforgiving of poor soil preparation. Most problems - forked roots, poor stands - are preventable with the right bed preparation.
Soil preparation is everything
Carrots need deep, loose, stone-free soil to develop straight roots. On stony or compacted ground, roots fork around obstacles. Dig or fork the bed to at least 30 cm, removing stones and breaking up any compaction. Avoid adding fresh manure or rich compost directly before sowing - this causes forking and hairy roots. Use compost from a previous season worked in well in advance.
Sowing thinly
Sow seed thinly in drills 1 cm deep, 15–30 cm apart. Carrot seed is small - aim for one seed every 2–3 cm if possible. Overcrowded seedlings compete poorly and thinning disturbs roots and releases the smell that attracts carrot fly. Thin to 5–7 cm spacing when seedlings are 3–4 cm tall, doing so in the evening to minimise carrot fly risk.
Germination takes patience
Carrots germinate slowly - 14–21 days is normal, up to 30 days in cold conditions. Do not assume failure too early. Keep the seedbed consistently moist during this period. A light cover of fleece can improve germination speed and protect from carrot fly at the same time.
Carrot fly
Carrot fly larvae tunnel into roots, causing characteristic brown scarring. The adults fly low to the ground, so a 60–75 cm barrier of fine mesh or fleece around the bed is an effective physical deterrent. Resistant varieties like Flyaway and Resistafly significantly reduce damage without any barrier.
Harvest timing
Carrots can be harvested from finger size onward. Leaving them in the ground is fine in most soils until hard frost threatens. Autumn-sown varieties in mild areas can overwinter in the ground. Lift with a fork rather than pulling to avoid snapping roots.
Relevant to