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Large & In-Ground Lemon Tree Fertilizer Kit

$44.99
$40.99
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You planted or potted up a lemon tree for the fruit, for bowls of lemons off the patio, not for yellowing leaves and a handful of small, dry fruit at the end of the season.

But once a lemon tree moves into a large container or goes into the ground, it feeds from far more soil than a small patio pot, and the little kit that fed it before runs out long before the season does. Underfeed a growing citrus tree and it tells you plainly: pale or yellowing leaves, thin new growth, blossoms that drop instead of setting, fruit that never sizes up.

What lemon growers want at this stage is simple. Feed the tree enough, at the right time, without turning it into a part-time job or a shelf full of half-used bags.

That is what this kit does. It carries enough season-long feeding, micronutrient support, and bloom and fruit support for a large container lemon tree or a young to mid-size in-ground citrus tree, applied as one simple routine instead of four.

Key features

Sized for large containers and young to smaller in-ground citrus. One kit feeds a 30-gallon container tree, two 15-gallon trees, or three 10-gallon trees for a full season.
Controlled-release NPK 18-6-12, 6 to 8 month release. A nitrogen-forward, lower-phosphorus feed that releases over months rather than days, matched to how everbearing citrus grows.
Micronutrient foliar or soil spray. Corrects the deficiencies that show as yellowing citrus leaves, with iron, manganese, zinc, and copper, sprayed on a simple two-week rhythm.
Calcium, magnesium, and boron bloom support. Improves blossom quality and fruit set for more and better lemons.
Pre-measured and simple. Complete citrus nutrition applied on a simple schedule, without the guesswork.

Ingredients

Everything in the kit, with a season application calendar:

  • Controlled-release NPK 18-6-12, 6 to 8 month release. 3 cups, net wt 24.6 oz (697.4 g), covers up to 15 sq ft. A nitrogen-forward, lower-phosphorus feed that releases over months rather than days.
  • Essential trace elements spray. 1 oz, net wt 1.2 oz (34 g), covers up to 312 sq ft. Iron, manganese, zinc, and copper for the deficiencies that show as yellowing leaves.
  • Calcium, magnesium, and boron nutrient spray. 1 oz, net wt 1.2 oz (34 g), covers up to 312 sq ft. Supports blossom quality and fruit set.

How to use

Three products, one simple rhythm. The kit includes a container-size chart and a week-by-week calendar. Everbearing lemons flower and fruit almost year-round, so they are fed a little more often than seasonal fruit trees.

  1. NPK 18-6-12 granule, feeds the roots. Apply the pre-measured pack around the base and root zone of the tree, at the amount for your tree or container size on the included chart. Reapply every two months through the year, for example January, March, May, July, September, and November. The coating keeps feeding between applications.
  2. Essential trace elements, for plant health. Apply as a foliar spray or as a soil drench. Foliar: mix one pack with 64 oz of water and spray the leaves every two weeks, year-round, to keep foliage green. Increase frequency if leaves yellow or show stress. Soil: mix one pack with 128 oz of water and drench the root zone for gentle feeding, any time to correct yellowing.
  3. Calcium, magnesium, and boron spray, for bloom and fruit. Apply as a foliar spray or as a soil drench, every two weeks, focused on flowers and fruit throughout the year, since everbearing lemons carry both at once. Foliar: mix one pack with 64 oz of water. Soil: mix one pack with 128 oz of water during bloom and fruit development.

Getting started, first month: week one, apply the granule to the base and spray the calcium. Week two, spray the trace elements. Week three, spray the calcium again. Week four, spray the trace elements. Then keep the two-week spray rhythm going and reapply the granule every two months.

Why?

A lemon tree in a large container or newly in the ground feeds from far more soil than a small pot, so it needs more to stay in steady growth, and the most common reason one of these trees underperforms is simply that it never gets fed enough to match its size. This kit gives a large-container or young in-ground citrus tree complete season-long feeding and bloom support, so you get greener leaves, better fruit set, and a harvest that reflects what the tree can actually do.

Makes how much?

One kit feeds a single 30-gallon container tree, two 15-gallon trees, or three 10-gallon trees, and so on by total soil volume, or a young to mid-size in-ground citrus tree, for a full growing season. Feeding one small patio lemon in a 3-gallon pot or smaller? The container Lemon Tree Kit is sized for that. Feeding a mature standard citrus tree with a wide, established root zone? Plan on more than one kit to cover the full area.
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Large GrowScripts Lemon Tree Care Kit

Large & In-Ground Lemon Tree Fertilizer Kit

$44.99
$40.99

Frequently Asked Questions

How many trees will one kit feed?

It scales by total soil volume: a single 30-gallon container tree, two 15-gallon trees, or three 10-gallon trees, and so on, or a young to mid-size in-ground citrus tree, for a full season. Follow the per-tree rate on the label.

What size and age of tree is this for?

It is built for large container citrus and young to mid-size in-ground trees. For a single small patio lemon in a 3-gallon pot or smaller, the container Lemon Tree Kit is the better fit. For a mature standard tree with a wide root zone, plan on more than one kit.

Can I use this on in-ground trees, or only containers?

Both. It works for large containers and raised beds and for young to mid-size in-ground citrus. Application differs slightly between the two, and both methods are covered in How to use.

Which trees does it work on?

Lemons, including Meyer lemons, plus lime, orange, grapefruit, mandarin, kumquat, and other citrus with similar needs. The nutrition supports growth, bloom, and fruit across common citrus.

Is it safe for edible fruit?

Yes, when applied as directed on the label.

How is this different from the small lemon kit?

Same feeding approach, scaled up. The small kit is sized for one lemon in a 3-gallon pot or under, while this kit covers a large container tree, a few smaller potted trees, or a young to mid-size in-ground citrus tree. If you have a single small potted lemon, choose the container Lemon Tree Fertilizer Kit instead.

All about feeding large and in-ground citrus trees

Feeding citrus trees in the ground

In-ground citrus trees draw their nutrients from a wide root zone that extends out to, and often beyond, the dripline, which is the circle on the ground beneath the outer tips of the branches. That is why fertilizer works best when it is spread in a band around the dripline rather than piled against the trunk, since the feeder roots that actually take up nutrients sit out at the edges of the canopy. As a tree grows and its canopy widens, that root zone grows with it, and the amount of nutrition it needs each season grows too, which is why this kit is sized for young to mid-size in-ground trees and larger trees are fed with more.

Why bigger and older citrus trees need more fertilizer

A citrus tree's nutritional demand scales with its size and its fruit load, so a mature producer needs far more feeding than a young tree putting on its first branches. When a citrus tree is underfed, it tells you plainly through pale or yellowing leaves, short new growth, weak flowering, and small or sparse fruit. Feeding to match the tree's size keeps growth steady and gives the tree the resources to set and size a full crop instead of dropping fruit or coasting through a light year.

Pro tips for feeding a larger citrus tree

Feed at the dripline, not the trunk, so the fertilizer lands where the feeder roots can reach it.

Time it to the season by feeding through active spring and summer growth and easing off in late season, since late feeding pushes tender growth that does not harden before cool weather.

Use new growth and leaf color as your gauge, because healthy citrus holds green foliage and puts on steady new growth, while pale leaves and short shoots signal it is time to feed.

Do not skip the micronutrients, since many of the deficiencies that show up on citrus as yellowing leaves come from missing iron, manganese, zinc, or magnesium rather than from a lack of nitrogen.

How this kit simplifies larger-tree care

Instead of buying and measuring three or four separate products, this kit combines steady controlled-release feeding, a micronutrient spray, and bloom support into one pre-measured routine you can actually keep. That consistency is what keeps a large-container or young in-ground citrus tree in steady growth, since the difference between a tree that fruits and one that stalls usually comes down to whether the feeding happened on schedule at all.

Container or in-ground: which kit do you need?

If you are feeding one lemon in a 3-gallon pot or smaller, the container Lemon Tree Fertilizer Kit is sized for that. This kit steps up to large container trees and young to mid-size in-ground citrus. For a mature standard tree with a wide, established root zone, plan on more than one kit to cover the full area.

Related guides

  • Container Lemon Tree Fertilizer Kit (link to /products/lemon-tree-fertilizer-kit)
  • Citrus fertilizer (link to /collections/citrus-fertilizer)
  • [Link to your lemon or citrus feeding schedule guide]
  • [Link to your "why are my citrus leaves yellow" guide]
  • [Link to your "citrus not fruiting" guide]