Nitrogen Fertilizer

In spring and summer, apply once weekly at 2 tsp per gallon, using a watering can or a hose-end sprayer on the 2 tsp setting. In fall and winter, cut back to every 4-8 weeks. Because this is straight nitrogen with no phosphorus or potassium, use it as a supplement alongside your regular complete feed, not as the only fertilizer — and don't overapply, since excess nitrogen causes problems of its own.

At 1 tsp per quart, the 8 oz bottle makes about 48 watering cans of feed. For a typical shelf of 10–15 plants fed every 1–2 weeks in season, that's several months of feeding — and the 32 oz bottle four times that.

Uniform yellowing or pale green that starts on the oldest, lowest leaves is the classic sign of nitrogen deficiency, which this product corrects. But not all yellowing is nitrogen — yellowing between the veins points to magnesium or iron, and whole-plant yellowing with wilting often means overwatering. Nitrogen fixes the pale, hungry look of a plant that's simply short on it; if the pattern is different, the cause is likely different too.

Any concentrated nitrogen can burn if overapplied, which is why the three-source blend here matters — the urea and ammoniacal fractions release more slowly than pure nitrate, giving a steadier, lower-burn feed. Still, stick to the labeled rate, water it in, and avoid applying to drought-stressed or bone-dry plants. More nitrogen doesn't mean faster growth past a point; it just raises the burn risk and pushes soft, weak growth.

The three numbers are the percentages of nitrogen, phosphorus, and potassium. 15-0-0 means 15% nitrogen and none of the other two — a targeted nitrogen supplement rather than a complete fertilizer. It's meant for situations where a plant needs nitrogen specifically: correcting a deficiency, greening a lawn, or feeding leafy growth. Pair it with a balanced fertilizer that supplies phosphorus and potassium so the plant's full needs are covered.

The nitrate portion works within days, so pale plants and lawns often green up noticeably within a week, while the ammoniacal and urea fractions extend the feeding over the following weeks. Existing severely yellowed leaves may not fully recover, but new growth comes in greener and stronger. For lawns, the green-up is usually the fastest and most visible response.